I've worked in both Europe and the US, and in my opinion, US workers are far worse off for it. You earn more money in the US, you can advance faster, but you have next-to-no vacation time (and even when you do, you're still often expected to be reachable by e-mail), maternity/paternity leave is pitiful, and you have to pay large health insurance premiums, amongst other things. I know that isn't the case for everyone,…
some of us love work.
When I was in my late 20s and early 30s I worked all the time - I loved it! At some point though I became disillusioned with work. There was always more of it, and it was primarily for someone else's benefit. If you're working for yourself I can see a stronger case for putting in those hours, but you still risk seeing those years go by in a haze of largely undifferentiated time sitting behind the keyboard, or what have you, with likely little reward at the end. It's possible to have a work-life balance, still enjoy your job and be productive, take vacation, etc. Work can become a soulless endeavor, just as pursuing wealth for its own sake.