You may be able to do better at the resort CS locations as you can request the dressing on the side or no dressing at all. I know I have done that with the beef salad at Contempo more than once. In the parks, I had the beef salad (which was new in August - used to be chicken ceasar salad) from Cosmic Rays. The chicken ceasar salad at Sunshine Seasons is made in front of you, so you can ask them to skip the cheese for example. I don't know if they will be able to make you a salad without the dressing. I have really enjoyed the Cobb salad at WPE, again I just asked them to put the dressing on the side.
The reason I got salads often is because I am simply a big veggie eater, but I hate most dressings.
As an aside, if you decide to get a sandwich, most places are willing to substitue the fries or chips with a bag of sliced apples or a bag of baby carrots. They would be a healthier option as well.