> That's a funny thing to say for an American, because, to Europeans, American toilets are much too public: doors don't go to the floor or ceiling, and even "walls" are thin sheets of wood/plastic loosely joined together with huge spaces between them.

... or exactly as public bogs in high use areas such as motorway service stations are generally built across the UK, France, Germany, Italy, Czech Republic, Hungary, Bulgaria, Greece, Cyprus. I've only listed some of the countries I have directly been to. Can't say I've noticed much difference in general between bogs in the US and anywhere else these days. Some do have gaps to aid cleaning and some don't.

~35 years ago I did have a bit of a shock on discovering my first "stand and deliver" style toilet in (somewhere) with a floor to ceiling pole to assist with accurate and steady arse positioning. These are rather rarer these days but still to be found.