Here in America, I had ... 31 days off work last year, and usually travel completely off grid. There exist employers with less generous policies in the US, and there exist workaholic employees, but neither is necessarily the norm.
Yes, this is my sense, too. I have 25+ days of vacation a year, and I take every one of them. My manager has more vacation time, and he takes every last day, generally to very isolated locations. Our CEO is known to go off the grid for weeks at a time.
If I travel for more than two weeks (my family road trips across the country each year), I do take my laptop, but only to work remotely between destinations. By "sneaking" in a few days of work here and there (like when stopping in to visit family), I can extend our trip.
My impression at other companies with less generous vacation policies is that many "rank and file" employees do disconnect during their shorter trips, but management generally doesn't leave the laptop/phone at home.