I was there on the first Monday and Tuesday of October last year. Crowds were very light. 15 min or less wait for most attractions - Hulk, Spidey, MIB.
We got there at rope drop and rode most of the big rides by lunch. Rode FIre and Ice in first row (both) many times back to back.
No one used FOTL passes as the wait was minimal.
With WWOHP, it will probably be more crowded but probably not that much more.