We went on the 21st and I thought it was busy. We made an early dinner in CRT for 4:25 so we'd be ready to go. It's weird, the rides weren't all that packed....most did not have a wait and those that did had a 10 min wait tops. But the park seemed very busy. The parade route was busy, but that's to be expected.
All in all though, it was very manageable and VERY worth going. I would do it again in a heartbeat. it was a blast.