As someone who has been using iOS7 for the past 3 months now, my opinion may be a little different than those who just experienced it for the first time yesterday.
First, the minimalism is deliberate. What at first may look like they've wrecked something may in time be something that you not only get used to, but that you find has made it take less swipes and less time to get to what you need. The whole theme of iOS7 to get the OS out of your way and to let the apps take full focus. Of course, since many apps are not yet updated to be prepared for iOS7, you will see that some apps "fit" on the new OS and other apps just look like crap. Microsoft did this first with the Windows Phone and Palm did it with PalmOS/webOS before that. It's a dramatic change but overall I think people will be more productive on the new design (even if they don't like how it looks).
My most used feature is command center. Swiping up and being able to toggle bluetooth, wifi, flashlight, control audio playback, share, and air drop all from one little tool is extremely useful.
iTunes Radio kicks ass and I use it so much that I've exceeded my monthly data quota twice so far since getting the first beta of iOS7.
Notification Center no longer contains the current temperature, which is annoying as hell when I'm trying to figure out what to put on to go for a run (because stepping out onto the porch to feel the current temperature is far too much of a burden!).
Finally, give it a bit of time. The capabilities that developers have in iOS7 are SO much better than they used to be that the things apps are going to be able to do easily and cheaply are staggering. I would expect a lot of great new features to show up in some of your favorite apps and a LOT more indie games to start cropping up in the next few months.
p.s. "Unicorn Vomit".. That is AWESOME. I am totally stealing that phrase.
