I'd check with the individual hotel. Even though Orlando is missing from the Disney Club web info and the booklet sent with your membership, I've found when I call the hotels directly they don't have that restriction. I'm guessing the Disney Club is hoping you'll assume you can't use it but I think I've read of other people using the Disney Club card for discounts in Orlando. Since the search function doesn't work it's hard to check.
Hope you have a great trip.
Carolyn