Hi Jillian! Nice hearing from you again!
My absolute favorite spot for seafood at Walt Disney World is
Narcoossee's which is located at the Grand Floridian Resort... please note, this is a Signature location and I think you said "No Signatures" in your initial question. The food is amazing and the location can't be beat... situated on the banks of the Seven Seas Lagoon with incredible views of the Magic Kingdom and Cinderella Castle.
For non-Signature Seafood and pasta, have you considered Downtown Disney? A few of my very favorite restaurants are located here and you can take in the sights and sounds of this amazing entertainment district after you fill your bellies!
I recently had the pleasure of "eating around" Downtown Disney and I absolutely LOVED Paradiso 37, House of Blues, and Raglan Road. The Lobster Mac and Cheese at House of Blues is knock your socks off, the Crazy Corn at Paradiso 37 is divine, and the Bread Pudding at Raglan Road is reason enough to go! Each of these restaurants has a nice diversity of entrees including both seafood and pasta dishes!
My daughter loves Rainforest Cafe, and while the atmosphere is fun, the food isn't my personal favorite!
Another great on-property choice for seafood and pasta is
The Wave, which I mentioned previously. They pride themselves on fresh, sustainable fish options and they have yummy pasta as well!