If you're lifting but not doing deadlifts then you're not actually lifting. I say this with tongue-in-cheek but a serious tone.

The same goes for squatting.

Generally, your deadlift will be the movement for which you can move the most weight and the effect of moving this weight on your body cannot be overstated.

You're not just hitting muscles but adrenals and CNS. You're building the core of your body like nothing else, which makes you strong in all sorts of other movements.

Just standing there and holding the weight will isometrically load you up like nothing else.

Proper form requires good back and hamstring flexibility, which is something a lot of lifters don't have. Strength without flexibility is a recipe for injuries.

So while the deadlift looks just like you're picking something off the ground (which is true), there's a lot more to it (though not as much as in a squat). And like the squat, this exercise pays huge dividends.