Canadians with enough funds can use the US system or other countries. In addition there are also private medical clinics. If you can get past the high taxes, it is nice to have this optionality.

By design the US system should work better for those with more money.

An anecdote with the Canadian system:

A family member was diagnosed with Stage 3 form of cancer, and was receiving Chemo within a week. They have received excellent treatment the past 4 years and have "beat the odds" so far. I'm pretty sure the bill for this would be somewhere in the range of 500K to 1M in the US. The main costs for this so far has been parking, and some travel expenses for an out of City surgery.

I also know of someone of similar age who was going to be waiting well over a year for a hip replacement. (They went out of country I believe)