Honestly, I simply turned my phone's screen on this morning to check my bank/credit card balances, and the 4.2 notification popped up. I have an Australian (Telstra) Galaxy Nexus, but I flashed it to Takju quite quickly upon receiving it. I guess I just got lucky in that I picked up the OTA quite early - there are countless frustrated users on r/Android still waiting on it (and I almost grabbed the image to flash it myself).
The notification toggles thing is cool, as the toggles were one of the things I was hoping to hack in by rolling my own Android. They're not complete toggles, more like shortcuts, and the inability to customize them sucks a little bit... but it's still an improvement over what I had.
But the photospheres and the improved camera... oh lord. The camera just seems to work much better than 4.1's did - maybe I'm imagining it. I tried out the photo sphere thing down at the creek, and it's amazingly intuitive and works really bloody well. What happens when you view them on G+ (if you have me in circles) is pure magic, I'm curious to see if it splashes over to Blogger. The creek? Well that's the subject for another post.