If you want vacation, negotiate for it. Your pay might be lowered commensurately, but there is no free lunch. Why would you care if other people choose money over time?
On the other hand, of the last 5 years I worked for other people, 2 of them were working 3 days a week. Most of the time, if you ask (and are willing to take the hit in wages) /my/ experience has been that employers are surprised when you ask, but they seem to be happy enough to accommodate.
note, usually you have to work more than 30 hours a week to get employer-paid health insurance.
Even in the UK some employers can be very "macho" about vacation - regarding holidays as something for wimps. I had someone trying to recruit me for an investment bank a while back and he got quite upset when I refused to consider the 22 days they were offering.... he more or less accused me of being soft for wanting so much holiday time! Given that they approached me I regarded this as a very odd way of trying to attract new employees.