The only other place I've heard of Babycakes sitings other than their DTD location is Beach Club Marketplace.
If you're only GF and not anything else free then there are other options around WDW besides the standard GF brownies and cookies. A few places have creme brulee (I know LeCellier does and I think maybe one of the France restaurants) and I know that Chef Mickey has cupcakes and Crystal Palace had in-house made brownies (yes it's still a brownie but it's not the same as the packaged ones). I think they have a flourless chocolate cake at a few places as well, maybe Hollywood Brown Derby? Next door at Starring Rolls they offered us a flourless chocolate cake that they said they'd have to go get but we can't eat that due to milk. We've also been given some sorbets all decked out with berry and other fruit mixtures.
Yup, it sure does get boring but at least chefs try to be creative with how they serve the stuff. I sure wish those of us with multiple allergies still had the brownie as an option.