Here is an excellent article on the subject of This American's Experience of Britain's Healthcare System.
The author has been far more articulate than I could be. With the exception that I never shared the author's initial dislike of the NHS, her experience of the echoes mine. Perhaps her post is far more convincing for the fact of her initial dislike of the NHS.
I'll note in passing that Wonderful Husband and I have yet to be able to set up our our health insurance. We seem to have fallen through the cracks of The System in trying to apply for our (potentially very expensive!) private health insurance. Quite a difference from our recent experience of the NHS when WH received emergency eye surgery on the NHS in a matter of hours.