That used to be the way, but, they've been creeping up the start of "the holidays" everywhere in the past few years. This year...
MK gets immediately decorated for "the holidays" the same night that the Halloween decorations come down which is Oct 31 or Nov 1 depending on the year. The replantings take place the next night. Then Nov 8 begins MVMCP.
For DAK, and DSH, and DS: Nov 8 is the start of their holiday: The bird show gets a Diwali overlay, Sunset Blvd Season Greetings start (Jingle Bam starts earlier on Nov 6 and the tinsel stars went up last week), the Christmas Tree Trail is open on the 8th.
Epcot's holiday season officially start Nov 18 this year (though the first Candlelight concert starts Nov 22... earlier than last year).
The resorts gets decorated throughout November as early as possible, it just takes some places longer than others. All decorations should be done before Thanksgiving.