Well, actually crowded is an understatement. The last couple years, DL has actually had to "close the gates" a few days, during the "winter break", period because they reached capacity. They don't close them to hotel guests though! Your best bet is to get an early start and use Fast-pass as much as possible. You'll especially need fast-pass for It's a Small World & Haunted Mansion. Even if you aren't an IASW fan, you have to see it done for the holidays! Just set your priorities and take your time...you'll still have fun!!