I went today. It was nice, but very crowded with long waits by every ride. I noticed that as the day went on, and people started leaving, the lines were much smaller, and many attractions that previously had long waits now had no line at all. Obviously since it's a kid oriented place, most people (including any of us) would rather get there early and leave at a normal time, but if you are willing to go at 2:00 for example and stay until 8:30, you will accomplish a lot more in a shorter time - especially in the later hours.
BTW, after 3:00, entry is $20 less, and you can really accomplish so much in a short time in the later hours. I would say that each hour after 5 is worth 2 hours earlier in the day.