We also ate at the Plaza 2 weeks ago. Everyone loved their meal.
Three had the strawberry salad, 1 had a veggie sandwich, and I had a chicken with ham sandwich that was great.
It isn't fancy, basic sandwiches and salads, but great service and great food. We will go there again.
There are too many FABULOUS TS restaurants on the "monorail run" to bother with the MK. Kona at the Polynesian is 5 stars and 'Ohana is pretty darn good too. The Contemporary boasts The Wave and The Grand Floridian is chock full of delights.
My point is: all of them are just a hop, jump and skip away and soooo far superior to anything the MK serves...imo.