Portion size is huge!!! I have been there many times, although the last time we went was in July 2005 as my health has been very poor since then. Hoping to go again next year though.
Although I haven't been since being diagnosed with diabetes I have always been aware that many restaurants have notices on their menu that they can cater to people with things like celiac disease, wheat allergies, this allergy, that allergy, and everywhere seems to have their menu marked with "D" beside diabetic choices, markers to say whether food contains wheat, low fat choices, etc. On that side of things, you won't have a problem.
If you have any general questions about Disney please feel free to PM me. I can also give you web addresses of some forums which have posts/threads dealing with people who are diabetic and how they have coped out there. Very useful stuff.
Oh, and I'm VERY jealous. :lol:
Jackie