I take Wet Ones in the single packages in my backpack with us to the Parks. And I always use the toilet liners in the restrooms.
That's about as far as I go.
Even then, it does not really protect you. I caught a bad flu at Christmas at
DisneyLand a couple weeks ago. It was our last day there and so we added one more day, just so I could stay in bed with a 104 temp and aches and sweats and chills...the whole nine yards of the flu. There was no way I could even have gotten on a plane the way I felt and just think how many people I would have exposed at the sickest point of my flu.
So even if you wash, wash, wash, if someone coughs or sneezes on you, you may still get sick. We are so careful about washing with the wet ones after touching anything and always before a meal, we find a restroom and really wash our hands.
Sadly Airborne does nothing for me for the flu or colds, so I just drink lots of fluids and take Tylenol and try to sleep and sweat it out. I was sick for 8 days this time and then at the end of the flu (after we already gotten home from Christmas at DL) I caught a cold. Murphy's Law with me.
Of course my immune system is not what it should be. I had spine surgery in July after spending the last year in a wheelchair at home and hardly ever getting out and getting exposed to anything.
I remember as kids we got exposed to everything, even ate dirt, (Oh don't tell me you did not eat dirt if you were a child of the 50's or 60's! We ALL tried it once!!!!)

and built our immunity up. Though these days I would not let kids eat dirt...Too many nasty things in it from our changing world. We were not so germaphobic back in the 50's/60's/70's and we got sick with a bug that was going around, built our immunity up and then stayed well for a long time.
I think we overuse the *antibacterial* soaps. They tend to destroy ALL bacteria on our skin, even the good bacteria that defends our body against the bad ones. It is making for more virulrent forms of flu and cold viruses and not really doing anything except leaving us exposed to the germs. A good bar of regular soap is much better than antibacterial cleanser anyday. So say the doctors. I have heard it over and over and over from my own physician and in journals and other places. And the overuse of antibiotics for viruses does nothing but build super germs. Antibiotics will NOT cure a virus, only bacterial infections. Too may doctors still give out antibiotics to placate a worrying parent when their child really just has a viral flu or cold and it is destroying the efficacy of our best weapons against the really bad bacterial infections out there.
The best thing for the flu or a bad cold is rest and fluids and more rest and more fluids! Maybe Tylenol or Aspirin if it can be tolerated or given depending on the age of the patient..AND if it is really bacterial then antibiotics ARE the answer! A cold or flu CAN develop into bacterial bronchitis or pneumonia and once that happpens antibiotics are the course to go.
I ain't fun being sick at Disney. I have been sick three times there. Once was a really bad intestinal flu that had me writhing in pain and I had it coming from both ends with a 105 fever that would NOT break. We called a house call doctor to the Disneyland Hotel at 5AM and he gave me a shot of some antinauseal meds and some pills to take over the next few days. I was in bed for 5 days with that one again a Christmas trip to DL. Always at Christmas, always at the height of the flu season in the Winter....
There really is not much to keep a viral bug from getting you in a Park with hundreds of thousands of other people in various stages of health around, but the wet ones are helpful and washing your hands is a great idea. If you get someone sneezing and coughing on you, not much will help unless you wear a poncho and a face mask...and who wants to do the Parks all wrapped up like they work in a level 4 containment chamber at the CDC?
Have fun and try to stay well!
Susan