I go to Orlando exclusively in October now but only every four years. I used to add a February here and there but that is peak tax season and doesn't work anymore. October has had consistently great weather (end of the month) and crowds that keep increasing due to more schools having a fall break, more people attending the Halloween events at both WDW and US, free dining or other promotions and, I think "the secret got out about the great time to go".
I can manage crowds better than humidity so I'll still go in October.