Sounds like a great dad-son trip you have planned. Since you asked the question to me, I'm guessing you are looking for some "guy" places. Although I think you could be comfortable at any of the restaurants, a few great choices immediately came to mind:
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Chef Mickey's (Contemporary Resort)
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Ohana's breakfast with Lilo & Stitch (Polynesian Resort)
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Hoop-Dee-Doo Musical Review (Fort Wilderness - requires two table service credits)
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Whispering Canyon Cafe (Wilderness Lodge)
Be sure to have your son ask for more ketchup!
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Sci-Fi Dine-In Theatre (simple burger fare, but you get too eat in a car, and watch movies!)
I will also challenge you to consider
Cinderella's Royal Table. I know it seems like a girly thing, but it is in a castle, the boys get a nice play sword, and there are lots of cute princesses that would love to spoil a little prince! Just consider it, at least. My son definitely enjoyed it when he was five years old.
I hope some of these suggestions hit the spot, and I wish you both a great trip.