We're talking about being expensive to the consumer though, so it definitely isn't expensive outside the US. Not to mention all of what you said there is often not the case. I'd argue that things that require specialised care, machinery or a lot of doctors/nurses are the minority of cases.
The US cost is also definitely not double. It's orders of magnitude higher than other countries where people pay for healthcare, and effectively infinitely higher than countries with free healthcare. As an Englishman living in Japan I'm shocked at how expensive healthcare is here, yet every American I've ever met here raves about how cheap it is.
Yeah - that's not how the world works. You may not get a bill at the end of your hospital visit, but the doctors still get paid, etc. Roughly speaking, healthcare is 10-15% of GDP in most countries.
It's well known that per-capita expenditure, the US spends approximately double what other countries do. There are lots of reasons why that is true, but mostly it's inefficiency of all the people arguing about who pays for for what when you're dealing with medical insurance.