I've been here since December 3.
Thursday 12/4 was the least crowded I've ever seen MK. The only rides with more than a 10-15 minute standby wait were Jingle Cruise and 7DMT.
Friday 12/5 at Epcot was similarly uncrowded until about 5pm and then it was the worst crowding I've ever seen, worse than weekends during Food and Wine.
During the week starting 12/8, we hit all the parks.
MK on Tuesday and Thursday were light crowds. We did a lightening lane multi-pass on Thursday and got through Pirates, HM, Peter Pan, Winnie the Pooh, Ariel, and Jingle Cruise in 4 hours. Like the previous Thursday, both Tuesday and Thursday had mostly short standby lines at MK, with the exception of 7DMT, HM, and Jingle Cruise, which were about an hour on Thursday.
Epcot on Monday wasn't crowded until 5pm, but Friday was packed solid all day (GoG was a 110 minute standby wait!).
DHS on Wednesday wasn't crowded at all (IJ stunt show they only used the middle set of bleachers, and ToT was a standby walk on!).
Saturday at AK was more crowded than I ever remember, and am very glad we bought the LL for FoP and the LL multi-pass for the other rides we wanted to go on. We left at 5, and it was a burden to get through the huge crowd to get to the exit!