Keep in mind for the OP its just two adults, so only two appetizers. It really doesn't have to be a lot of food. It could be that one of you orders a salad and the other a soup to start your meals.
I recall the appetizers at our sit down restaurants:
Coral Reef - crab claw item, wasn't that good nor a large portion, wasn't something I shared though I'm sure I offered
Narcoossee's - Crab cakes were awesome, my mother had the chowder also delicious, we both had bread too (the butter makes it kind of addictive). I was not able to finish my surf & turf(scallops for me instead) nor the kids dessert I ordered, I'd also had a Mango smoothie as my beverage. Honestly, when I substituted the scallops I think they gave me a full entree portion. I was expecting a half portion, but did my best to eat it all!
Narcoossee's was our first night meal, so we set the bar pretty high to start. We had Lunch at Coral Reef the next day. All other TS meals were buffet (Chef Mickey's, Boma, H&V Fantasmic).