1) In the U.S. you can work for years at a company before getting more than 1 or 2 weeks paid vacation.
2) Most Americans don't travel much outside their own state or region, let alone country. Most don't even own passports.
3) Even when not on the job, either at night, on the weekends, or on vacation, Americans tend to stay attached to their job via email or phone.
It's true that American salaries can be a lot higher than European ones, especially for developers. But Americans also typically do a lot of side jobs or have households with 2 or more full-time jobs per family, 2 or more cars per family. So one has to ask if it is all worth it?