I had a blast (as with each year). My response is becoming predictable!
Highlights for me include -
Heavy attendance at each panel I was a part of. Even the one on Thursday (which only had 10 or so people) was filled with 10 people who were engaged, interested and added a lot to the mix.
People having fun at the Match Game. It is a tough game to play in a play-to-win kind of way, but a fun game to watch and be a part of. With all the serious stuff I had to do ("intellectual" panels, etc), this was the perfect antidote.
Improv, specifically the strange parts (the long-form stands out in my mind as crazier than any JRPG). Plus, nice to have a slightly old/slightly new group of people.
Showing new people around. After 8 Magfests, I still love showing the place off to people who have never been. Pretty much everyone takes to it and is made welcome, fits right in, and has a kick-ass time.
Overall, the best bit from a catching up point of view was all of Onimu-Shots into the party. I spent over 5 hours in that room and drank loads of beer, but I never felt like I needed to go anywhere or do anything else because everyone I wanted to talk to ended up being in the same place.
Worst part, of course, is the withdrawal.