Skiwee: Please take this in the good humor I have ascribed. If you are at Disney, there is no escaping germs. If a person scratches their booty, then touches the rails in the queues for the rides, and then YOU touch the rail...YOU GOT BOOTY GERMS! At Disneyworld, you are going to be touching rails, rides, doors, etc. that others have touched and those people don't wash their hands!
Also, people do the nasty on top of the bedspread in the rooms (as you can plainly see in many adult videos!). Those don't get washed very often. Our local news did an expose on bodily fluids on bedspreads.
I think the hot tub is one of the least of your concerns if you are worried about germs. At least it has some chlorination going on.
I just try to wash my hands frequently and avoid putting my hands in my mouth.
By the way... last trip to Disney, I did get a touch of food poisoning/salmonella/funk! So it is impossible to avoid it!