There is a Fantasmic package that gives you a meal and priority seating for Fantasmic. Anyone can get in without the package, but if you buy the package you get special seating. The restaurants included are Mama Melrose, Hollywood and Vine, Brown Derby and I believe 50's Prime Time Cafe.
Personally, I think the package is a waste of money and energy, the food at the restaurants mentioned is not spectacular, and if you get to Fantasmic at a reasonable time, you won't need priority seating. During our upcoming trip, my husband and I are cruising over to the Yachtsman and then returning for the show. Just know that you do have options open to you. Have a great trip!