We went Dec. 29 once and will never do it again. It was the most crowded I've ever seen it, and we go 1 to 2x per year. You run the risk of the parks closing due to overcapacity if you don't get there first thing in the morning, and if you leave during the day, you may not get back in. The decorations are lovely, but the crowds weren't worth it in my opinion. We've been just after the Thanksgiving rush and all the decorations were up and there were no crowds, so maybe we're spoiled. It was also very unseasonably cold the time we went in Dec. a couple of years ago.