That only happened on 12/31/1999, and even still I don't think DAK (which was yes, very crowded) ever actually reached capacity. DAK pretty much never reaches capacity (or I'd wage to say even comes close) for NYE, but this is no surprise given people tend to migrate towards parks with fireworks that night. On that one day, it is no indication at all on how popular (or unpopular) the park is. Studios rarely closes to capacity, as does Epcot (but that's more due to the sheer size of the park and how much it can hold.) The only place it it holds true that you can *expect* to be closed by 11am is Magic Kingdom, always, given, period.