I did tip extra for the outstanding service. We were 3 people at a round table, and for each dessert course, 3 servers would swirl around our table and set down our 3 plates at the exact same time - beautifully choreographed and must have taken a lot of training.
The one thing we did NOT appreciate was that unlike dinner, the host was talking the entire time during the dessert tasting. Part of it was interesting, but a lot of it was sales pitch for the wine pairings, and IMHO that diminishes the fine dining experience.