Wow. UMMMM ... ever heard of the environment. and You'd have to carry like 10 blocks into the park in the a.m.
If you had read my response more closely, you would have seen that I really didn't think it was necessary at all, but people who are concerned with issues like this tend to be really serious about it. Personally, I don't have any issue with touching public toilets or touching any fixture in a public restroom; washing our hands has always been enough for us. No toilet paper barriers, no seat covers, no antibacterial gels, no foot flushing; anyone who knows me will tell you I'm just the most horribly nonchalant parent on the planet when it comes to public toilets. Just wipe properly and wash your hands and everything else is forgotten.
My recommendation *if* the poster was that determined to provide a step, was to take
*1* styrofoam block, and to put the block into a grocery sack each time it was used, so as to provide a barrier between the block and floor, not to guard against germs, which are everywhere and unavoidable, but to avoid carrying around other people's stale urine. The average child isn't going to be peeing so many times in a day that this would really have an outsize impact on the environment, given how much trash a Disney park generates in one day. However, for the sake of environmental stewardship, I'll offer my and my childrens' lifetime quota of extra toilet paper, toilet seat covers and antibacterial gel bottles as a carbon offset exchange for this one poster's use of a handful of plastic grocery sacks.
The only reason that I even offered the idea was that the poster was planning to put the stepstool in the stroller basket. Most parents of young children also store food and things like sippy cups in those baskets, so there is a fair possibility that gunk from the step might have found its way to a child's mouth in that scenario. IMO, THAT is what would be unwise from a cleanliness standpoint.