I lived in the US in the eighties, had good health insurance through my then husband's union. Felt very unwell, went to the doctor and while I was there my insides exploded. Turned out to be a ruptured ectopic pregnancy. Doctor's office organised ambulance, phoned ahead to hospital etc but when I got there, bleeding to death, I was shunted into a side corridor on a trolley while they checked my insurance.
Only when satisfied my insurance was valid did they start treatment and rush me off to surgery. But not before making me sign all sorts of forms to waive my right to sue them if I got AIDS from the blood transfusions. Just imagine, I'm on my own, in pain, haemorrhaging - I needed five pints of blood - and required to sign long complicated multi-page forms before they would treat me. Naturally I signed the forms!
When I came round I was in a two bed room with my bed curtains closed. I heard visitors arriving for the other bed, next thing my curtains were ripped back and a strange man asked me what I was in for! I pressed my emergency bell and a lovely Caribbean nurse came in and told him off. I was in bits, hadn't known I was pregnant before it got ripped away, and in pain, and worried about money and what my husband would say.
Whole thing was a nightmare, I was discharged after five days and given an itemised bill for my 5% co-pay. Every aspirin, wound dressing and bottle of drinking water was accounted for. My share was over $7500, I was told I was lucky. When I went for a post surgery check up with my doctor, ~I was told I couldn't be seen after that until they had proof of payment of the $7500. STBEXH complained I'd cost him a lot... I ended up leaving him, but that's another story...
A couple of years later, now single, I returned to the UK, registered with my GP locally and within three weeks got a letter to come in for a checkup based on my medical history. Not one penny charged and as I was unemployed, I was told about a fund I could claim my bus fares from.
There are other stories I can tell of American friends in the States' experiences with their healthcare system but I won't as it's second-hand info, the story above is what happened to me. I whole-heartedly believe in the wonderful NHS.