There are two options for reserved seating for Fantasmic that include dessert and beverage service. They are premium seating on the riverfront, or seating on the balcony off of the Disney Gallery.
It is heaven, pure heaven! If you book the balcony seating to watch Fantasmic you get to enjoy an all you can eat dessert buffet and it is heavenly. We enjoyed this last November and wow, is all I can say to describe this event. We were a party of 8 (4 adults and 4 kids) and everyone found at least three things they enjoyed. I am not sure if you can find any of these desserts anywhere else in DL! Well worth it!!!