We were there this past November from Nov. 1 - Nov. 6th and the crowds were fine. The only time it was unmanageable was Saturday night (1/5) at Epcot. Between Food & Wine coming to a close and the half marathon that weekend, the world showcase was literally shoulder-to-shoulder. Otherwise I thought the crowds were pretty good. The weather was just about perfect. There were definitely Christmas decorations up in the MK on 11/1. The entire park wasn't decorated but we definitely commented on how quickly they were able to switch over. I think the Christmas Tree on Main St. was there on like 11/2 or 11/3. The first castle lighting was around the same time. I think the first
MVMCP was the Monday after we left, so 11/7 or so. The rest of the parks and resorts were slowly decorated over the week and most had up a tree by the time we left.
We're going back this year from 10/28 - 11/4 because we enjoyed that time of year so much.
Also, I asked my coworker from Jersey who has been to Disney a number of times about "Jersey Week" and she had absolutely no clue what I was talking about. Not saying it's not a real thing but I think it's made out to be a little bit more a deal than it actually is.