If you have a life-threatening issue, MI, stroke, cancer - you will be seen quickly and the standard of care is similar to the US.
If you need something treating that is non-life-threatening, yes, you may need to wait some time.
Don't get me wrong, the NHS is being handled appallingly by the current ruling party, but it is not collapsing - thanks to the doctors, nurses and support staff going above and beyond to keep it running.
Sure, but there are plenty of anecdotes about ambulances taking hours to arrive right now, as well.
"Life-threatening" is also too fuzzy of a term, here. Don't get me wrong -- I'm an immigrant to the UK from the US, and I think things are better here for most people -- but mental health issues, gender-affirming care, etc. are not treated as life-threatening even when they genuinely are, and care is nearly impossible to get in a timely manner. I'm not especially well-connected to the trans community, but I have some friends who are, and it's quite common for trans people in the UK to move to the US because they can access care much easier and much faster.
Additionally, objective measures of wait times show them increasing unsustainably right now. :(
Which has now collapsed so in practice you need to go private if you need any kind of decent, timely care. And it never covered dentistry from what I’ve heard.
In practice you end up paying twice - once in taxes for the dysfunctional health service you can’t actually use, and a second time in the form of either insurance or out of pocket to go private when you do need healthcare.