How about Cape May at the Disney Beachclub Resort? It's a seafood dinner buffet (no characters). Menu is posted on this site. I think breaded shrimp is served only 2 nites - Sun & Wed maybe. Every nite they have clam chowder, hot crab legs, hot clams in the shell, cold peel & eat shrimp, & some kind of fish, plus many other items. Also non-seafood items. Includes dessert items. Small salad bar.
At Miller's Ale House & Orlando Ale House, on one day/night of the week they serve a special Lobster dinner - 1 1/4 lb Maine whole lobster. Used to be $10.95, but I think the price has raised by a few dollars - still worth it. I don't remember what sides it comes with. One location on IDrive & one not far from Crossroads Shopping area (can find addresses & directions on their website). Crossroads is at the non-Disney end of the Hotel Zone road that leads to Downtown Disney; real close.
Joe's Crab Shack has lots of great seafood items (can find their menu online). We love the one at home; haven't tried the Disney area ones; have read that the one at the front of Celebration is the best one in the Disney area. Their crab nachos ($10 at home) are to die for - yum, yum - & huge! They also have bucket meals of various seafood items. Even have pasta w/seafood choices.
Of course, there is always Red Lobster (in Crossroads shopping area). We had their Shrimp Alfredo & it was really good. Came with salad & one side & an endless supply of their yummy garlic cheese rolls. Their clam chowder is good too. They have lots of other seafood choices.
I think Bahama Breeze has seafood & it gets rave reviews, but we've never been there. It's close to Crossroads too.
Enjoy!