yeah the UI is much different. I read somewhere apple is trying to keep the UI consistent among XCode debugger and Safari debugger. Notice, they have almost the same UI design.
That's true, it is somewhat similar with the XCode interface. I'd rather they switch the XCode interface to be more like Safari 5 had.
The interface in XCode isn't bad. My big problem is that you can't view source any more, it's crammed in that panel. The list of requests? Crammed in that panel. JS console? Inspecting elements? All crammed in there.
I always feel light I'm fighting to find what I want instead of switching between things I might need.
This year's WWDC they broke down how to use the debugger and some advanced tips (2 sessions that you can watch online: https://developer.apple.com/wwdc/videos/). Btw, new Safari seems to have changed the UI again, this time for better the icons are bigger now :)