I would not make a special trip...We really enjoyed our dinner and could not believe how expensive it was and we did not pay a penny because it was on the plan...We all got the lobster and thought it was very good....We also liked the setting...It is nice to look out the window at the water and the boats...We all that said, I still would not make a special trip if you were planning to go to DTD...I would fear that you would be unhappy with it for some reason (many people do not love it there) and you would be upset that you missed that time you could be doing other things...We always plan one half day in DTD...That is why we went....
Maybe you should go to Cape May Cafe for the Clam Bake...It is in the Beach Club which is a five minute walk from Epcot...You can go to Epcot, leave for dinner, then come back after you eat...It might be a nice break from the park...I really cannot think of another place in the parks that would have good seafood...The buffet food at Cape May is also just good, not great.