The US just has an attitude more consistent with upstarts/bootstrappers. While it'd be great if we could all afford to work only for 10 months of the year and to pay our employees for 2 months+ of time with no productive output, that's not how it works when you're a small business scraping by. Once you get to the F500, of course, things change, but mandating vacation time makes it really difficult for small companies to afford new hires.

Most people do not "overwork immensely".