The problem with Mousesavers is that they don't list the BLACKOUT dates, which is what you need to look out when guesstimating discounts for the next year.
The first week of December has been blacked out for discount for at least the last five years. Late November will depend on when Thanksgiving falls. When it falls late, like this year, you don't see many discounts. You best bet for a deep November discount is the second week of November and the best bet for a deep December discounts is December 12 - 20. With package discounts like
Free Dining and Stay/Play/Dine, you can check in on the last day of the promo and get the discount applied to your entire stay. With a room only reservation it is only good for the specific dates of the promo.