To start off, I want to specify that I an thoroughly enjoying ios7! I like the icons, although they had to grow on me, and I love the new functionality and look. A couple of initial thoughts (and this is in no way a rant or complaining at all!):
1. Control Center - I love this. I love that I don't have to have a specific flashlight app installed, and don't have to go through the settings to switch on DND mode, etc.
2. Notification Center - I actually preferred the old version. I would assume this is because I don't use my phone the way many do, and therefore I do not need the 3 different views available. I am already used to it, so no harm done!
3. App Switcher and Safari Page View - One thing I will have to get used to is not having the home screen automatically become full screen when I close out all the apps I had running. The same goes for Safari when I close other pages and have one remaining. Not a big deal, just an adjustment.
Actually, that's all I have right now! Haha. I love the new os, and can't wait to see what comes further down the road from Apple!