I never got the "if we socialise health care people will wait for ages" thing. I'm in France and once I was sick, I called in sick at work, then I looked up a doctor, found one in my street, called them and got an appointment for two hours later. And it was just a cold or something.
And it's not a rare stroke of luck, either, when you call in sick at work you have 48 hours to send the medical slip thing to justify you were really sick (we don't get a specified amount of sick days like you do in the US).
On the other hand, France also has free education, which means we might have more doctors? Since it's free to study to become one and they get paid well... On the other, other hand, to become a doctor you need to pass a "concours", which is a type of exam. Here we have two types, "examens" and "concours". In an "examen", you need to have over a certain grade to pass. In a "concours", there is a specific amount of room, and only the best so many people get the degree (if you have less than a specific grade, you also don't pass, but usually there are many more people who get a good grade than spots).
So the number of people who can become doctor any given year is limited anyways, and yet I've never had a problem finding one on short notice. I've always gone to a different doctor every time, too, because I move a lot so I just pick someone close to where I live.
The French system isn't 100% free by the way. It covers basic stuff and people have the option to get insurance to cover more. Insurances state what they do or don't cover, but I've never heard of "pre-existing conditions" for insurance companies. I mean, they cover stuff such as aesthetic surgery for instance (well, some insurance companies do. As I said, which you pick decides how much coverage you get, and how much you pay for it).
I think it's a good way to do things (everyone gets the minimum, you can pay the difference to get more) but I hear we have some budget problems so I can't swear it would work everywhere.
What I don't get is that if insurance companies in the US call everything pre-existing conditions, then wouldn't it make more sense not to get one at all, since when you need it it will bail out anyways, and this way you save on insurance payments? Or do they tend to still end up costing less on the long run despite trying their hardest not to pay after promising they would?