So at first I wasn't paying much attention to the Apps Edge, thinking its just another gimmick and it's just extra space for a few more short cuts. Recently I've been playing around with it and found it to be a very good multi tasking tool. Basically since the edge toggle is always on top no matter what app you're in (except games I assume), you could just swipe it out and jump into another app from there, without minimising or exiting your current app.