I have, as have members of my family, and have received excellent care for some fairly serious conditions. I think the Canadian system is under funded, and I'm sure there are plenty of true horror stories, but they always get highlighted by people who want to tear down/prevent a public healcare system so I feel I have to bring up that my family have received good and timely care. When I really needed healthcare I was unemployed and it was stressful enough seeking care without having to worry about insurance. Now that I'm employed I'm happy to pay back into the system.
I value having public health care. I hope the US can come up with a good public system so that Canada can stop resting on "at least we're not like the US!"