And likewise if I pick up a prong collar ALL my dogs come running because they want to go out and jog/bike or train! The only connection they've made is that prong collar = going away from home and doing something fun. I don't condition dogs to prongs, either it's an appropriate tool or not. If it shuts the dog down, it's not appropriate and I would not be "conditioning" the dog to accept it (JMHO).
I basically agree with everything, but this. You have conditioned them, you may not have intended to or thoughtfully went about it, but you have.