No, it is not just doing it. The key is the context.
Whatever situation you are in, you will have a role to perform and I am assuming that role will not to be to point at the patient and yell, "EEEEEWWWWWWWW!!!!"
You may cough, you may gag, you may throw up, but you will not let any of those get in the way of performing your duties - whatever they are. The advantage we have as healthcare workers is that in those situations, we have something to DO. For some reason, viewing the things you once found "icky", while they are still icky, will provoke a markedly different reaction in you.