I love the jalepeno cheese pretzel at Animal Kingdom.
At DHS I love the baked goods at Starring Rolls Bakery. They have wonderful cupcakes!
At MK I love the strawberry shortcake sundae thing at Mrs. Potts. And the Main Street Bakery is also wonderful. Very similar to Blue Ribbon Bakery in DL but not quite as good ( I love the cinnamon twists

at Blue Ribbon and have never seen those at MK's bakery)
At Epcot I love the Kringla Bakery in Norway, espcially the school bread, cream horn and rice cream. The bakery in France is also to die for, love the creme brulee and everything else they have. So delicious! I also really enjoy the pastries in Morroco. And Sunshine Seasons has some nice fresh fruit desserts (right near Soarin in the Land Pavillion).
I will warn you that the churros in WDW cannot compare to the ones at
Disneyland! Even the ones in Mexico at Epcot are not nearly as good.
Don't know if you are staying oniste or not, but most of the resort cs' have really tasty desserts. The tie dyed cheesecake at Pop and the cherry cobbler at Port Orleans Riverside come to mind.
I'll also mention beignets at the Port Orleans French Quarter food court. Even better than the ones at the take out place near Ralph Brennans in DTD at DL.
In DTD, be sure and visit Goofy's candy co. So much good stuff it will put you in a sugar coma!