I know that way back in June I thought iOS 6 was the greatest thing, but when I use it now, it feels like going back to Windows 95.
Same here. iOS 6 looks and feels very old to me now.
The gestures (especially in Safari) feels way more productive to me. Having to pin-point the "Back" buttons in iOS 6 feels old-school, and definitely takes longer for me.
I also think the Task Switcher, and how the new Notification Center is divided up into three tabs (Today, All, Missed) add productivity too.
With Task Switcher, being able to see a screenshot of each app (for whatever reason) makes it quicker for me to find what I'm looking for, vs. just only seeing the app icons. I also like how you can swipe up with three apps at a time to remove apps from Task Switcher. If you're in an app and bring up Task Switcher, you can now kill that app. In iOS 6, if you did that, it never showed the current app. You had to exit out to the Home Screen and restart Task Switcher from there.
I really really really love the Today tab in Notification Center. Having a few of my day's calendar from the current time forward that I can swipe into from anywhere on the iPhone (i.e. I don't have to return to the Home Screen and then launch the Calendar app, return to the Home Screen and relaunch the app I was in) definitely adds productivity to me.
I also like how Notification Center shows more text in the notifications. It's usually enough now that I don't have to go into the app to figure out what the notification said, like I do on iOS 6.
Background App refreshing is pretty cool, too. A lot of my apps are now supporting it, and it seems like when I pop into them, they refresh a lot quicker than when on iOS 6.
To me, there's a huge amount about iOS 7 in terms of productivity enhancements that a lot of people don't seem aware of. They just focus on the UI change. To me, a fair amount of the UI change seems required to bring a lot of these productivity enhancements to life.