For many, this one falls into the category of "fixing problems you didn't know you had." If you have a lot of apps installed, though, you probably have already been frustrated by the share menus on previous Android versions. God forbid the app you want falls too low in the alphabet, because you will be scrolling like the dickens to share with it. Android developers clearly recognized that they were really wasting some space, so the Android M version is a lot more efficient.

Left and middle: the old share menu Right: the new one

If you look closely, you'll notice that you can actually see more share options in the compact version of the new menu than you could in the fully expanded view of the old one. We've seen a pattern throughout our Android M Feature Spotlights of Google ironing out some of the minor annoyances of previous iterations and this is a perfect example of that.