We are heading for Marathon weekend number three and expect the same bigger crowds as last year. Last year they split the half and full marathons to different days opening the race up to thousands more. The 5k was also so much larger and now they have moved it to a third day. Magic Kingdom on the 3rd was as crowded as any summer day. We opted for the Universal parks after that. And yes, we are from the south and for the second year in a row we will return to school late - January 7th. This has happened in 2002 and 2006, and both trips to Disney were met with big crowds. Both times we went for the entire week. In 2005 we were not out that week, so we only went down for the long weekend to run. By this time last year we had a great rate on a room (DTD). This year the same rooms are almost 50% higher - so they are not having a problem filling them. Unless I HAD to go that week, I would never book a January trip until after the marathon weekend.
ps Last year we went to MK on the 3rd because Buzz Lightyear was closing the next day. Several other things were closed too. Popular time for ride refurbishment.