"Jersey Week" is usually around the 2nd week of November. There is a Teacher's Convention for a few days and a lot of families from New Jersey schedule their vacations that week because it's lower attendance than, say, the summer or Christmas.
In my opinion, it does get very crowded that week. We were there once or twice and I remember leaving a day early to come home because of the crowds. At that time though, there wasn't FP, so just try and utilize FP and EE.
Have fun!