We've been the last 5 Jersey weeks. It's fine. If you read this board, follow advice on FP, understand how to refresh, make good use of rope drop etc. it's manageable. Yes - its' crowded . . . as is Disney pretty much year round now but from Wed - Sun. we didn't wait on one line over 20 minutes and easily got multiple extra FP per day. The main things to avoid are World Showcase on weekend evenings and just expect if you go to see fireworks at MK on a non-party night - it will be a madhouse (we did our first Dessert Party last year to avoid it and it was a very smart - any yummy - move).
jersey posts their school calendars online. a quick google tells you the dates of the teachers convention (7-8) and it precedes a holiday weekend because Veteran's day (also a holiday at a lot of schools) is the following Monday (11)