This story contains a lot of spoilers about "ER."

(CNN) Watching TV heartthrob George Clooney rescue a boy from drowning in a storm drain in Season 2 of "ER" made me realize two things when I was 8 years old:

1) I was heterosexual.

2) "ER" was excellent television.

Now, [redacted] years later, I've confirmed both those things are still true by rewatching all 15 seasons of the medical drama.

I tore through the first 12 seasons in about four months. It was not for a work-related assignment; I just felt like doing it.

George Clooney's Dr. Ross had a hero moment in "Hell and High Water."

I took a long "ER" timeout midway through Season 12 because my mother claimed I was becoming a hypochondriac, and I didn't disagree. Six months later, the entire series made its streaming debut on Hulu, the universe's way of mocking me for spending more than $200 on the digital downloads via Amazon.

With its arrival on Hulu, I slowly worked through the remaining three seasons, completing my 331-episode rewatch weeks ago.

In addition to giving me more credits toward my doctorate in television medicine, completing my self-imposed mission a few months ahead of the 25th anniversary of "ER's" first episode has given me clarity, both as a person who writes a lot about television for a living and someone who loves television.

'ER' is prime example of aging gracefully

Since finishing "ER," I've been pleased to learn I'm not alone in taking on the task of watching the whole series. Far from it, in fact.

According to Hulu, almost 100,000 subscribers have binged the entire series since it launched exclusively on the service last year. Nearly two-thirds of them are female and half of them are under the age of 34.

According to Hulu, almost 100,000 subscribers have binged the entire series since it launched exclusively on the service last year.

A representative for the service also shared this: The most common age of an "ER" binge watcher is 27, "meaning they were only 2 years old when the series premiered in September 1994."

A simple explanation for these stats? "ER" aged very well.

It's not perfect, of course. The doctors' treatment of transgender patients was often problematic, for example, and some attempts at telling stories about minorities missed the mark.

But as a whole, the show evolved with the times.

"ER" featured storylines and arcs about addiction, AIDS, post-traumatic stress, sexual abuse, LGBT parental rights, and so much more, in some cases long before those issues were widely showcased on television.

Actress Laura Innes, who played Dr. Kerry Weaver, told TVGuide in a 2007 interview that she felt producers and NBC "didn't really get enough credit" for having her character begin dating a woman in Season 7, which aired in 2000-2001.

"It was a big deal to have a main character on a mainstream show come out," she said.

It's easy to forget there was a time when these were bold moves.

Yes, a TV show can teach you about death in a way that helps you in real life

"ER" had a lot of death, but it was really a show about valuing the life that comes before it.

No greater example of this exists than the eight-season arc of Dr. Mark Greene (Anthony Edwards). In his time on the show, the character was put through the ringer -- a violent attack, a divorce, a number of devastating patient losses, an awkward facial hair phase. He always came back, though -- to save lives, to lead his team at County General Hospital, and to teach others how to lead.

He ultimately succumbed to a brain tumor at the end of Season 8 in one of the show's most heart-wrenching episodes.

Anthony Edwards took a bow in Season 8's "On the Beach."

When that episode aired, I was 14 years old, about the age of Greene's daughter. I remember confronting, in a way that felt extremely personal, the idea of my parents' mortality

I spent about 15 years avoiding that episode, even changing the channel when it aired in repeats on the Pop Network. When I reached that point in my rewatch, it was less than a year after my father had died unexpectedly. Still, I powered forward.

Watching it again broke me apart in ways that are hard to describe, but also gave words to my pain in a way I hadn't been able to express at that point and led to an epic, cathartic cry.

I found peace in reflection, too. If we must go -- and we all do -- what better than having a life well-lived?

In describing Greene's departure in a 2002 interview with the Albany Times Union, executive producer Jack Orman admitted while the character's final episodes were sad, "there's a life-affirming element to it."

He wasn't wrong.

Photos: 16 celebrities you forgot were on 'ER' Chadwick Boseman – The future "Black Panther" shares the screen with Carl Weathers in a Season 15 episode, playing a young boxer who comes into the ER after taking a beating in the ring. Hide Caption 1 of 16 Photos: 16 celebrities you forgot were on 'ER' Jeffrey Dean Morgan – Before he was baddie Negan on "The Walking Dead," Morgan played a firefighter who needs the help of ER docs in the field after he gets trapped underneath a turned over train in the show's 150th episode. Hide Caption 2 of 16 Photos: 16 celebrities you forgot were on 'ER' Josh Gad – The future voice of Olaf from "Frozen" guest stars in Season 11's "Here and There" as a man serving with Dr. Gallant in Iraq. Hide Caption 3 of 16 Photos: 16 celebrities you forgot were on 'ER' Octavia Spencer – The Oscar-winning actress plays a patient named Maria Jones, a pregnant woman who has severe abdominal pain, in Season 5's "Hazed and Confused." Hide Caption 4 of 16 Photos: 16 celebrities you forgot were on 'ER' Randall Park – Park plays a man with developmental delays whose teenage sister has a baby in the ER in a Season 11 episode. Hide Caption 5 of 16 Photos: 16 celebrities you forgot were on 'ER' Jessica Chastain – The Oscar nominee appears in Season 10's "Forgive and Forget" as a woman who takes care of her sick father. Hide Caption 6 of 16 Photos: 16 celebrities you forgot were on 'ER' Niecy Nash – Nash has a brief role in Deason 10's "Missing" as a mom who believes her missing daughter was brought into the ER as a Jane Doe. Hide Caption 7 of 16 Photos: 16 celebrities you forgot were on 'ER' Taraji P. Henson – Henson is one of a few actors who show up more than once as a guest star during "ER"'s 15-season run. She made her first appearance as a family member of Dr. Peter Benton in Season 4 ("Of Past Regret and Future Fear"). She was brought back episodes later to play a different character. Hide Caption 8 of 16 Photos: 16 celebrities you forgot were on 'ER' Finn Wittrock – The future "American Horror Story" star played one of two Amish teens who are involved in a car accident in Season 10. Hide Caption 9 of 16 Photos: 16 celebrities you forgot were on 'ER' Nick Offerman – Offerman shows up in a Season 4 documentary-style episode ("Ambush") and plays a man whose friend comes in under respiratory distress. Hide Caption 10 of 16 Photos: 16 celebrities you forgot were on 'ER' Mike Colter – The future Luke Cage has a blink-and-you'll- miss-it appearance as a paramedic who treats an ER intern after an accident in Season 9. Hide Caption 11 of 16 Photos: 16 celebrities you forgot were on 'ER' Adam Scott – The "Parks and Recretion" actor comes into the ER in a Season 1 episode ("Full Moon, Saturday Night") after being hit by a car. Hide Caption 12 of 16 Photos: 16 celebrities you forgot were on 'ER' Keegan-Michael Key – The comedian appears (with hair!) as a member of Dr. Benton's legal team in a Season 8 episode called "Quo Vadis?" Hide Caption 13 of 16 Photos: 16 celebrities you forgot were on 'ER' Vincent Kartheiser – The "Mad Men" actor plays a troubled artist who comes into the ER after eating half a tube of paint in Season 6's "Truth and Consequences." Hide Caption 14 of 16 Photos: 16 celebrities you forgot were on 'ER' Kal Penn – Penn guest stars as a doctor in another hospital who treats Dr. Benton's young son after an auto accident in Season 8's "The Longer You Stay." Hide Caption 15 of 16 Photos: 16 celebrities you forgot were on 'ER' Dean Norris – The "Breaking Bad" actor helps Dr. Greene diffuse a bomb in Season 5's "They Treat Horses, Don't They?" Hide Caption 16 of 16

Reinvention is hard

Slumps are an accepted reality of any long-running TV show, regardless of what producers claim, and "ER" was not immune.

"ER's" happened around the time Noah Wyle, who played Dr. John Carter, scaled back his duties, and it seemed writers were having trouble highlighting the strengths of the characters carrying the load.

Admittedly, this made taking a viewing break during Season 12 easy and getting back into binge mode very hard.

The show eventually found its groove again.

An infusion of new doctors -- like John Stamos' Dr. Tony Gates, David Lyons' Dr. Simon Brenner and Angela Bassett's Dr. Catherine Banfield -- brought renewed life to the show to help it finish strong.

Speaking of which...

It IS possible for a TV show to nail an ending

"ER" had the luxury of knowing it was heading into its final season before it started filming. This helped them craft storylines that both referenced and brought back beloved characters from the past.

Alex Kingston, Eriq La Salle, Julianna Margulies, Innes, Clooney and Wyle were among the original cast who returned for guest appearances in the final season.

Perhaps best of all, though, the show succeeded in bringing its narrative full circle.

Not only did Dr. Greene's now-grown daughter become an intern at the hospital in the final episode, but the last scene featured the staff preparing for a big influx of patients from an industrial explosion.

Viewers never get to hear the patient's stories because the original theme song begins to play and the camera slowly backs away from the ambulance bay, signaling the end of the series.

In that moment, the sense is given that the staff is still there doing their jobs.

When I first watched the series finale, I was disappointed. That's the only thing that's changed in the ten years since I saw it. Now, I get it.

Closure is nice, but I rather enjoy believing the doors of County General stayed open.

And thanks to streaming, we can visit any time.