[soraia]

When I was there that time of year it was certainly a lot busier than I expected. I thought after New Year the holiday crowd would disperse as people went home to go back to school/work/etc but actually the first few days of January were some of the busiest I saw, and then you get into the runDisney marathon weekend (usually first weekend in Jan) where thousands of people come to compete in the races (5k/10k/half marathon/marathon) over the course of a few days.
I'd say it probably really only noticeably quietens down mid way through the second week in January.
Good luck & keep looking for that SDMT FP - hope it turns up and you have a lovely time