The gingerbread displays at the Deluxe resorts are taken down beginning January 1st.
Decor in MK stays up through the first weekend in January and then removal begins except for the Castle lighting that remains up and on display through Marathon weekend - the second weekend in January.
We were there 1/7-1/12 of this year. There were some decorations up on the 7th still at the Parks and Disney Springs, by the 11th/12th they were pretty much gone.
Sounds like resort decorations the first to be removed - we will try and do a little resort hopping on our first day to possibly catch the decor there.