Jersey week is not terrible crowd-wise. As mentioned above, the NJ teachers' convention takes place in Atlantic City. I'm from NJ and regularly take advantage of the time off to get down to Florida. Here are some of the pros and cons:
Pros.
If you time it right and get down to WDW for the entire week, then you have the opportunity to see the parks change from Halloween to Christmas and perhaps catch both the Not So Scary Halloween Party and the Very Merry Christmas Party.
The weather is generally still warm enough to get some pool time.
Cons.
Epcot will be VERY crowded on the weekends. This particular weekend is generally the last weekend for Food & Wine and includes the Food & Wine 1/2 marathon. The confluence of events results in HEAVY crowds at Epcot.
If you need to fly from the NY/NJ area, costs to do so will be high.
Hopefully this helps.
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7 trips in 3yrs (Poly, AKL, BLT)