I am a normal, healthy femlae adult with no immunocompromization.
I do none of the things listed, other than wash my hands.
I go to WDW at least 2x/year if not more. I also travel other places.
I sleep on the sheets, drink out of the cups, use the ice bucket, stand barefoot in the shower.
I have never had bedbugs, C.Diff, or athlete's foot.
I'm a nurse. There is nothing I am going to encounter in an airplane or hotel room that I have not encountered in a 25x more virulent strain at work. I usually get one cold per year, in November or so. I've had the flu once (don't get a flu shot) and have never had pneumonia. Used to get strep throat a lot as a kid, but I seem to have grown out of that!