Now this was in 2007 but....
we went to DW dec 18-24th 2007....it was the best trip EVER!!!
we go to magic kingdom around 1 PM on arrival day adn we completed everything we wanted to (including all 3 mountains, peter pan, etc) in 5 hours
There were virtually no crownds until the night of the 23rd and then on the 24th we went to DHS for 1/2 the day before we left and the morning wasnt too bad (i think everyone was checking in) but by the time we left the park around 1, it was getting very very crowded
HTH