I'm from Orlando, and we'll be here the whole time.
The storm should be out of Orlando by the end of Saturday. If you fly in on Monday, you should be fine. Will Orlando be fine?? That's the big question. In my experience, which isn't a whole lot, except maybe Charley, Disney fairs far better than the rest of the city. I won't bet on anything, but I'm pretty sure Disney will have power and water by Monday. For your wedding, the weather will probably be back to normal again, keep in mind it's the rainy season, everything might just look a little wind blown.
Hope everything works out beautifully for you!
~Danielle