joel.lovell (8/30/2018)
I'm still trying to figure out if I even need this or not. What would those who have it, say it solves or finds useful first and foremost?
If you're into animation, Curve editor (which is usually called graph editor) is the main thing. Whenever you want to smooth an animation, or change an arm or leg trajectory, it's there for you. You can play with individual keyframes or optimize the whole animation at one stroke, as you wish. Curve editor is everything. It's as essential as water for a fish.