Ok, I will admit I only read the first 3 pages of this thread, however, I have one response to say here:
Despite the (really pretty) animations being a tad slower than we'd like, at least at this point, I have to say that, with all of the changes they have made, my OVERALL feeling using iPhone 5 with iOS7 beta 3 is that it is more responsive and the things I need access to are right there, so functionally it is faster and easier. And, I have to say, I disagree about multitasking...the new way of dealing with multitasking is much, much faster (iOS 6 and below: press and hold and wait wait wait for the circle with the x to show and icons to vibrate? Uh, yeah, over that, now I can just double click and switch over or swipe away, very nice!)
Also: they could do 1 of 2 things: 1) speed it up by the time GM is ready? OR 2) You could interrupt the animation by clicking on an icon? Then the animation changes to open that app? (I'd like this).