As all the people saying they stand up to stretch their legs imply- we shouldn't be mad at the jerks who get up to get off the plane first, we should be mad at the airlines for packing planes so full that there's not a reasonable amount of leg room unless you pay a premium for it.
I have noticed that people in first class are often still sitting there when I leave in coach. And I don't jump up to be the first off the plane.
I find it comical to watch all the people in a hurry to stand in a line for 5 mins before the door even opens. Even for long west-east coast flights I can manage to sit for a few more minutes.
It's the same with boarding. I just wait till most of the line is done so I don't have to fight to get to my seat.