I am French but have been working 12 years for a very large US company , spent a lot of time in the US, go friends there - an witnessed/helped several Americans moving to France.
Salary and healthcare were already covered. The fact that over a 3 days drive across Europe you visit 4 or 5 countries with vastly different cultures is a big plus. And by vastly I mean really vastly. We've been in constant wars for 2000+ years and this created a very nice and specific melting pot + cultural differences.
School will be very different. In France you will have a more formalized way of education (which is not a good thing), but also a very liberal one. Children will be drinking tap water starting at kindergarten and and stay like this their whole life. They won't (usually) go to school on Wednesday.
The office will be less politically correct. You will have people discussing politics and religion - though this became less outspoken the last 10 years or so.
You will have good baguettes and average bread - but still eons better than the average US bread.
Bureaucracy is mcu better than the stereotype. But not good either. You have to learn the power of the "pffff" sound you make with your eyebrows up - which means "I understand that this is the rule, but you know, I have to do/get/send that and it is a huge problem if I don't". Many foreigners foolishly assume that a "no" means "this is not possible".
See https://www.youtube.com/watch?v=Pae2AMnmUVA for the more scientific approach to how to be French when you are not.