Nice baseless FUD that's completely wrong. :)
As an American, my longest waits and worst care were all in the US. I pay just a couple bucks in Japan and get far better, far faster care. Pissing blood from a major kidney infection and hospitals politely turning me away because my insurance was out of network and "oh this is too expensive for you. Try (next hospital that rejected me)" wasn't fun. Never had an experience like that outside the US. Here it’s “Do you have an appointment? No? Okay, we’ll see you in a few minutes.”
Not sure why Americans believe this meme, but it's very apparent that someone hasn't spent any significant time outside the country and is informed exclusively by facebook fearmongering when they say that. It's always "yeah, I know a guy who knows a guy who read an article saying the UK is worse!" America has massive delays for procedures already--the excuse doesn't work anymore.
But yes, the delays in Japan and the cost are a fraction of the US, and it's because there's more regulation. It's wonderful.