I have type 2 and done F&W the past few years (mostly food, not so much the wine! ) and had a blast! Closer to time, the menus will be up and pictures (YUM! ), and you can kind of ( with what you learn from your nutritionist between now and then ) guestimate carb counts and serving sizes. I like
Visual Serving Guide as a starting point to help you compare what things are supposed to be, but I'm a visual person...
The menus that Disney puts up and pics and reviews from the Disboards lets me pic and choose what I want, and lets me figure out what's worth "spending" my carbs on (Ireland chocolate Bailey's cake

). Usually, we just snack around the world, and that ends up being lunch and dinner, with a late night snack back at the resort food court or in the room if need be due to medication or sugar levels.
The big things I've found is a. test often, and b. make sure to keep hydrated with water- not diet soda (or other beverages ), but water. The past few times I've been it has been HOT and dehydration is not good in anyone, but really bad with diabetes. It can mask low sugar symptoms, so then you're suffering both and may not know it- especially if you're not used to hypoglycemia or like me, can't tell when you "bottom out".
Meters are really small now, and can easily fit into a pocket of cargo shorts without a problem, so testing can be done anywhere...
Have a blast!