Oh, Kristyn!
What a lovely question---because I think everything is not to be missed! With an 8 and 5 year old, you've got prime ages for loving EVERYTHING!
Here are a few of my non-character favorites:
Hoop Dee Doo Musical Revue at Fort Wilderness {an interactive, delicious, hilarious, musical show that will delight ALL ages}
50's Prime Time Cafe at Hollywood Studios {American comfort food and the funniest waitstaff ever!}
And some fun character meals:
Chef Mickey's at the Contemporary Resort {a fun meal with the Fab 5}
Princess Storybook Dining at Norway in Epcot {a must if you have a princess in your family!}
If you search for "best character dining" on the Mom's Panel you'll see other great suggestions, too. I know it sounds trite, but you really can't go wrong! All the meals are magical!
Don't forget to go ahead and get reservations by calling 407-WDW-DINE (939-3463) up to 180 days before your trip.