We were at WDW this year from late January until Superbowl Sunday which was Feb. 6. Crowds picked up, especially our last Sunday due to the following factors:
Superbowl Sunday, the game was in Jacksonville, I don't know maybe that had something to do with it.
Cheerleading competition. Tons of young girls and their moms, all very nice but lots of them that last weekend, especially at MK and MGM.
Mardi Gras. I have no idea when Mardi Gras is in 2006 but the LA schools have that time off and many of them head to WDW. Although with the hurricanes who knows what the LA school districts will do this year.
It was a great time to go, chilly weather, especially in the evenings but so nice. Shorter hours too but with the generally lower crowds, you don't need too long hours to get it all done.