Weekdays in October are probably OK, though a lot of schools have fall break. I've heard the Halloween night Halloween party is busy, but if you just got an AP you may be skipping the parties?
In December 2009, the second weekend of December, I believe it was, was great...weekdays were amazing and the weekend probably would've been busier but it rained! This year could be different since the Candlelight Processional is showing for what, 20 nights!?!
I found the days after Thanksgiving were not bad at all in 2011, and the week after Thanksgiving is short hours but low crowds. The days immediately preceding Thanksgiving are usually (but not always) reported as busy.