We usually go in October for the Food and Wine Festival, we love it!!!
The crowds have grown in October over each of our past 4 trips. The difference is noticiable. But the crowds are not as bad as summer or holiday times. If you plan, the crowds are manageable.
We missed hurricane Wilma last October by about 15 hours. But I read afterwards that the parks re-opened by 1 PM, so it wasn't too bad.
If you are there during a hurricane, the parks will most likely close. You will lose that day on your ticket, I do not think they refund days like that.
I wouldn't worry about hurricane season, nor would I let it prevent me from going in October.