I've actually just been reading about the savory options for snack credits and took notes! Yak and Yeti in AK has egg rolls or chicken fried rice. In Epcot there are a number of locations where you can get soup as a snack credit (Sunshine Seasons, Liberty Inn), There is a lobster bisque in France at the same place as the ham and cheese croissant, along with a bacon and cheese roll. Kabuki had a couple of sushi options. I didn't see a lot of non sweet options at MK other than clam chowder at CH, pretzels or popcorn. Same with HS.
We are staying at AOA and I saw that the food court has a southwest wrap that is a snack credit and create your own smoothies.