A doctor visit in France is 25€, the copay is usually 1€ (or 30% if you don’t have a complementary). My copay on my PCP in the US is $20. That’s not counting what happens if you do blood work, labs, if you go to an ER (where you don’t pay anything in France).

There’s more than an order of magnitude between those two numbers here. You can look at your OECD statistics, or look at the experience of people who’ve actually lived there.