I was at Disney last year for Hurricane Frances and it looks like Wilma and I will collide again this year.
As for what happened last year (the storm was coming in from the Atlantic side) - we were told to stay in our rooms from about 12 noon on the day the storm was going to come in until approximately 6pm the next evening.
Disney was excellent about keeping everyone informed via telephone messages and notes in our room. We never lost power and were able to pass the time away watching Disney movies and the weather stations on TV. We also had a deck of cards and a flashlight - which was not needed. Although the winds and rain were continuous, I always felt safe. But, then again, I am used to living in a windy area.
I am going to pack a small box of snacks in addition to the above mentioned items. Last year I had a rental car so I stocked up at the Hess Gas Station a few days before the storm hit. (and before there was a panic) I won't have that luxury this time, so I'll bring a few things from home.
What I am hoping is that in the next day or two, that the storm tracks further south and that we won't have to worry about it. However, I will plan accordingly. If the storm does hit, most likely my flight home will get cancelled and also hope that like last year, Disney won't "kick me out".
ps - don't forget the rain ponchos!