Ridiculous.
The phone is slower as a result of the animations. There's no ifs, ands, or buts.
There's no reason you shouldn't be able to tap or swipe anything until the animation is 100% finished. This is the case with other animations around iOS 7 as well. It's pretty clunky when you're navigating menus and you've tapped on "next" or "back" 3 times before it registers because it's waiting for the animation to complete. That's mega amateur in my eyes. Just a fraction faster and we wouldn't have this issue.
Better yet, just add a toggle (I know, so un-apple) for "Cinematic" animations or "Fast" animations, akin to how they let you pick "Natural" scroll direction or standard on OS X now.