We were at DL and DCA on the Friday after Thanksgiving. It was pure madness. Despite valiant efforts we only got on two rides the entire day and we stayed until midnight. We had reservations for lunch at the Blue Bayou and dinner at Ariels, and those times were the only escape from the crowds. To walk from Main Street to New Orleans Square took at least 20 minutes.
Frankly, it wasn't worth the money it cost our group (nearly $1,000 for 10 of us) for the day. We would not go on or near a holiday again. And, I'm going to guess that the week between Christmas and New Year's is probably worse than the day after Thanksgiving. Perhaps others on these boards can confirm or not.
Anyway, we had planned on spending the Friday and Saturday after Thanksgiving at DL and DCA. But, after the first day, none of us wanted anything to do with a second day at the parks. We spent Saturday at the beach instead. Much nicer!
Sorry to be the bearer of bad news. But, there truly is a point at which the parks are so crowded it's not fun and it's a waste of money. Just my opinion, others may disagree.