I think you are picking and choicing what you want to hear. People are telling you real problems and you say that you aren't a child, yet you also tell people that they must have forgotten what the US was like (i.e. since all of us don't necessarily have the same attitude of gloom towards the US that you do).
I will say as well, I have know several US citizens to have moved both to the UK and Japan, and many of them WILL say that the UK is worse. Mostly because Japan is SO different, you expect it to be different, but then they underestimate how different the UK will be. Take that or leave it.
I will also say, you need to be more realistic about your job prospects. You state you will be smart enough to have jobs in the UK to cover expenses. In loads of earlier posts, you have indicated you are unable to do this in the US though. Many US citizens find it very difficult to get jobs in the UK. Qualifications do not always translate. Some degrees are ignored. And frankly some may be less willing to employ a US person rather than a UK person for a variety of reasons. Also the recruiting process can be very drawn out here... months in fact. If you don't want to believe me, do a poll and see how difficult people have found it to find a job. How will you pay your expenses for perhaps months?
I complete agree with helle_chic, your options are almost certain better if you explore practical solutions in the US. Some of your earlier figures do not add up and I am curious if you do know all your options in the US.
And to answer your original question, at your request. I personally do not compare the UK system to the US system. In my specific experience, it is apples and oranges. Both have pros and cons, which makes it silly to say one is better than the other.
In the US, yes I had to pay more out of pocket up front but I am not convinced the costs are actually more. I have thought about comparing the amount I paid in taxes plus insurance in the US, to the increased taxes in the UK and see if it is truly more. My guess is that it wouldn't be that different, it just seems the US is more because I was seeing it come out of my bank account more frequently.
In the US, I personally found the doctors more responsive. I never felt like I was bothering them or being silly about my requests. If trying to figure out what was wrong, I felt like the doctor actually lead the situation and tried to find solutions.
In the UK, I find the opposite. I often feel guilty about seeing the GP. I have previously been made to feel like I was jumping the gun seeing them and they wanted me to wait weeks with the ailment first. I do have a new GP now that isn't like that, so that is an improvement. I actually have permenant damage to a foot, which I broke, and the UK system said wait and see how it goes. It reset a bit wonky on its own and I have problems with it now. I would not have had that happen in the US.
As someone else has mentioned as well, I have to completely direct my own care in the UK. I go to the doctor and tell them what I want done. What medicine or procedure. There is very little discussion of options. I have a chronic illness and luckly I know alot about it and CAN direct my care. But I am not a doctor and I don't always know the options, so it bothers me that if I weren't viligent then I would get poorer care in the UK.
That being said, I have had surgery (same procedure) in the US and the UK and had very similar successful results. So it is interesting that the methods are completely different from A to B, but I have ended up getting decent treatment in both places overall. Well, except for that foot.
ETA: I have private insurance here in the UK. Given that I do have a chronic illness, there is no way I would ever be without private insurance. The difference in care is night and day.