We love getting French pastries too. We also love the bakery in Norway and the cheesecake served at Sommerfest in Germany (also quick serve). Italy also has Tiramisu available at the outdoor kiosk. Sunshine Seasons in Future World, Starring Rolls at DHS and the Boardwalk Bakery at the Boardwalk Resort also have some great desserts. And while I love the "high end" desserts, my favorite dessert in all of WDW is the vanilla cupcake at Roaring Forks at the Wilderness Lodge. YUM!
As for table-service, we've never had any desserts that are any better than the ones we get at the counter service locations (I'm sure they all come out of the same bakeries) but we do love the Maple Creme Brulee at Le Cellier, the regular Creme Brulee at Chefs de France, the flan at the San Angel Inn, and the Key Lime Pie at Olivia's at Old Key West. I'd also recommend the sundaes at Beaches & Cream,