We stayed at BCV for New Years Eve. We did not want to go to any of the parks, but I think it was a good choice of a resort or BWV which was our first choice for this trip.
There was easy access to the boardwalk and it was very festive. It was also possible to see the fireworks from both Epcot and MGM.
Regarding crowds in the days after New Years Eve, I was astounded at how crowed it was. I suppose the busiest time we've ever visited before was in August, and I thought this was much more crowed. The crowds did not seem to go down until around the 3rd.