Try hard not be there Jersey week. I believe it's the first or second week of November. It's for sure a lot heavier than the weeks right before and right after.
We are spoiled when it comes to crowds (we love to go in January) but it was hard for us to go back to Disney after experiencing crowds that heavy. We had to wait a long time for most rides, and we didn't nearly get to do everything. You could also check touringplans.com for a better idea of the crowds. And if you have your trip already planned over Jersey week, it would be worth your time to use touringplans to sit down and decide what parks on what days and what times to do this attraction or that etc. It is by no means like summer time, just that one week in the fall where crowds are heavy compared to the other weeks.
Hope this helped!