Only one man has ever walked on water, only one man has ever successfully emergency landed on water.
You are right about the walking on water, but with the ditching you would have define successful. There have been many successful ditchings, just few jets. There is some great footage of a PAA Stratocruiser ditching in the Pacific. I believe it was ONA that ditched a DC-9 in the Caribbean, but not all lived. National put a 727 in the Gulf unintentionally, not sure if anyone died.
This not to take anything away from Sully. He is a great guy and am glad to see him and the profession getting the attention. I had a pax ask me the other day if I knew him . When I said I flew with him quite a bit they shook my hand. That was weird.