We weren't all that thrilled about travelling on Christmas Day either, but the savings in our room more than paid for the AP. We had planned to get APs anyway since we'll probably be going back in early May for a couple of days, but didn't plan on buying one last week. Once we saw that we were paying over 50% less than what we would be paying we decided to buy the AP and change our booking. We initially had CR Tower, but that wasn't available with the AP rate so we switched to the Poly. We're paying $260/night now, as opposed to about $550/night before switching to the AP rate.
BTW, the AP cost us $420 (we didn't get the one with waterparks, just the 4 parks), so we made up that price in less than 2 nights.