Too me, this is part of the 'Lost Magik" of Disney.
In years past, there was no evidence of Christmas beyond the Christmas Shop in DTD. You would go to the park on Thanks Giving...go to bed....And when you went to the park Friday Morning, it puked Christmas (in a nice way) all over Disney World. It was an almost overnight transformation.
Same thing on the removal...If you were at the park for January 1st, they would still have decorations up. But January 2nd, they were almost all the way gone.