Unique or different CS dessert options in the parks...
MK
Be Our Guest-Gourmet Cupcakes and Cream Puffs only available here.
Casey's-Cotton Candy
Columbia Harbor House-Apple Crisp
Cosmic Ray's-Gelato
Pinocchio Village Haus-Gelato
Tortuga Tavern-Gelato
AK
Dino Diner-Cinnamon Glazed Pecans or Almonds
Tamu Tamu-Chocolate Milkshake
Yak & Yeti Local Food Cafes-Banana Pudding, Frozen Lemonade
DHS
ABC Commissary-Lemon Meringue Cupcake
Min And Bill's-Shake, Frozen Lemonade
Starring Rolls-too many to list! Pasties, Cupcakes, etc.
Studio Catering Co.-Lemon Meringue Cupcake
Toy Story Pizza Planet-Cappuccino Cupcake
EPCOT
Sunshine Seasons-too many to list!
Les Halles Boulangerie & Patisserie-pastries!
Fife & Drum Tavern-Soft Serve Ice Cream, The American Dream
Katsura Grill-Japanese Ice Cream
Kringla-Sweet Pretzel, Rice Cream, many other pastries!
La Cantina-Churros
Liberty Inn-Apple Pie, S'mores Brownie
Lotus Blossom-Smoothie, Chinese Ice Cream
Promenade Refreshments-Soft Serve, Floats
Refreshment Coolpost-Soft Serve, Floats, Sundaes, Slushes
Sommerfest-Pretzel, Black Forest Cake, Bavarian Cheesecake, Apple Strudel
Tangierine Cafe-Baklava
You didn't mention Water Parks but...
Blizzard Beach
nothing special
Typhoon Lagoon
Tilly's Snack Shack-Sundae or Waffle Cone