I have taken dd to play therapy for anxiety. The therapist was a registered play therapist, and it did work in reducing her anxiety (intense fear of thunder). The therapist did not have training in autism and I think was sometimes confused by how to respond to dd's repetitive play, however it did help us. We've never done floortime but in my limited understanding, it is designed to help children, particularly those with autism, in communicating and interacting with others.