Useless keyframes, tedious routines and rendering glitches (among others) are, quite literally, a headache. Besides, these nifty little things can slow you down in ways you don't even realize. Now, the question is, how can you speed up your workflow in AE?
While there are several ways, After Effects hotkeys are definitely a great way to go about this. They'll help you work faster and keep you from getting stuck looking for that buried panel. Bottom line: they simply rock!