Hello, JP:  My 4 samples were intended to let you know where I was 'coming from'.  As noted, unlike in the surveys you cite, I haven't seen 3/4 quarters of respondents waxing lyrical and swooning over their encounters with the Canadian healthcare system.  That's all that I was saying.

"...my training is in stats..."   That's great!  Then you understand v. well how push-polling works, and how you frame a question to the general populace will heavily influence the kind of answer you get.  :-/  Right?

"...Canada spends 55% of what we spend..."  The huge flaw in the surveys you cite is the assumption that all healthcare delivery operates under the same conditions, country to country.  It doesn't.  Canada and Great Britain don't have our screwy tort system.  Most of the additional costs for us are, effectively, lawsuit insurance.  :-/  Which is one reason I don't see single-payer coming to the U.S. - the TLA won't allow it (unless they can sue the government for unlimited amounts).