and exactly how little has Apple added to iOS 7?
Are you using it?
Yes.
Are you developing for it?
Yes. And I've even been releasing apps (source code) making use of the new features (see for example https://forums.macrumors.com/threads/1600113/ ; a LOT more to come in the near future). So few people know for example the iOS7-specific camera API better than me.
If no then you know nothing about how much or little has been added. You've seen the public bit. Under the skin there are many additions.
There indeed are. Too bad Android and Windows RT have much more. This is the biggest problem with iOS7. It's just not enough - no split-screen multitasking, no radically enhanced, true multitasking, no Camera layers a'la Windows Phone 8 etc.