I was there on Thursday, Friday, and Sunday nights. It was the most fun I've had at a congress yet, but that's probably a function of my having only been to 3 congresses and my now being at a level where I can dance with any and everyone without being scared. I didn't watch a lot of shows at all (not that I didn't have the option

More on this below), opting to either socialize with friends or dance in another room instead. Free water as usual was clutch. It got really hot and I sweated A LOT, as did everyone else. Friday the floors actually got sticky because there was so much moisture in the air, and from what I hear, the same thing happened Saturday.
The one big criticism I have is the number of shows. Thursday wasn't bad at all in this aspect, but Friday had some 40 shows and Sunday had around the same amount. Friday I got there around 10:30...shows NOT EVEN CLOSE to over. A friend of mine came back to where I was standing like "I'm tired of sitting down". I asked when the shows started, she said around 8:30. They didn't end until well after 12. In fact, it was probably closer to 1 than 12. Sunday I went to a club first and didn't even get to the congress until like 11:30...the shows were still going. At 12 it was time for my friend to start DJing in another room so I went in there...but the shows were still going when I left. It was another 15-20 minutes before they were over. At some point it's just too much. Thursday the shows were over a little after 11; I really wish the other nights had been the same way.
I probably danced with too many locals; I wanted to dance with my friends, but I didn't take stock of the fact that I know twice as many people now than I did last year (which was before I started running with the on2 crowd). I didn't do any celebrity hunting, but I did have some amazing dances with randoms, so that's all that matters for me. Also an old friend that I went to school with in St. Louis showed up, which was great because the last time I danced with her prior was when I was nothing more than a sacrifice dance for her.
All in all, I'd say the congress was an awesome experience for me, and I was still buzzing yesterday. But I also decided that I need to get out to some other congresses when I get a chance so that I won't be around all my friends and by default I'll dance with a greater variety of people.