I couldn't really watch it, unfortunately, but the general feeling I saw on Twitter was that this was a vast improvement from last year's WWDC.
Gizomodo has a nice round up of the features announced. HomeKit sounds VERY interesting... it'll be fun to watch vendors try/not try to take advantage of that. And integrating Shazaam directly into Siri is pretty cool - but are people really hearing music that they don't recognize when they are out?
I just started messing around with this and have never used anything like it before. One question I have is that the Google Drive Folder that I have on my desktop is just kind of always there to be clicked on even if I am signed out on the computer.