Those dates are EXACTLY what we just did over Christmas just passed. Crowds were manageable on weekend and border days...about on par with what we faced in August. Epcot rides were swamped all days we went over, especially Soarin'
Best park we went to was MGM over that period. Granted, we really didn't give AK too much attention, but when we went to MGM, crowds were thin, and we got to do pretty much everything we wanted and more.
For us, the 16th to 233rd were Fri-Fri...we went to AK Sat morning and MK Sat afternoon/evening with EMH. Sunday we went to character breakfast and pool before heading over to the
MVMCP at 4pm for early entry.
Mon was Epcot and MGM, and with MGM such a success, we shifted gears ad went back for an all day MGM Tues. Weds was off (Downtown), Thurs was MK morning and Epcot with Candlelight Processional evening (Jim Caviezel was AMAZING...the highlight of the whole trip). Then Fri was MK until we left for the plane.
So you see we hit MK on the weekend days and Thurs/Fri leading up to the weekend. MGM was mid-week, which may have a lot to do with it. But the good news is that mid-week you may find ligher than average and can really get a lot of fun in!