Some of the sugar free desserts at WDW are pretty darn good.
My favorite is by far the one at Le Cellier--it's some kind of citrus mousse with raspberry foam and it's incredible!!! The pastry chef makes them to order so just let your server know when you arrive that you'll want one. Yum!
The no sugar added apple stack at Kona is another fine dessert--very tasty and a nice change of pace.
The "default" dessert, at a place with nothing special as a sugar free dessert, seems to be this small round cheesecake. It was served to us at least 4 times on our last trip (Contemporary Steakhouse, Liberty Tree Tavern, 50's Prime Time, and somewhere else). They all dress it up a bit differently, but it's the same cheesecake. It's not bad, but it's not great either. We've been served this same cheesecake at places whether we've made prior arrangements for a sf dessert or if we just showed up.
A couple of counter service places (Cosmic Ray's and Electric Umbrella for sure) have a sugar free brownie. I think it's really good and I'm a confirmed sugar eater. It tastes like those Little Debbie brownies. It's got a lot of malitol in it, though, so be careful. The first time he tried it DH ate the whole thing and was very sorry for it later! Go slow on those until you know how it affects you.
The Backlot Express has a very tasty no sugar added strawberry parfait on the menu--also good and a nice change of pace.
Finally, many places can make a no sugar added vanilla shake for you. The no sugar added vanilla ice cream is pretty easy to find at any ice cream stop in the parks or resorts (sometimes it's vanilla/chocolate swirl).
We've also been offered plain fresh fruit anytime we've asked for it.
As others have pointed out, none of this is carb or calorie free. But some of it is darn tasty!
