Hi Sarah!
Aloha! and thank you for visiting the Moms Panel!
Disney's Spirit of Aloha Dinner Show at the Polynesian Resort is a very popular show, in a very beautiful location. I believe the food is served to your table on platters, and it is likely you will be seated together with other guests on large tables.
I would recommend that you take a look at a website
www.allears.net which provides details of menus, with photos, and reviews of all the restaurants and dinner shows at Walt Disney World, and will probably provide answers to your particular concerns about the food, and the seating, at the Spirit of Aloha.
If you have any further questions about this, or other planning questions, please come back and ask me - I would be happy to help you plan your magical vacation.