I think it's really dependent on the management. I worked at an "unlimited vacation" job and Felton shame taking 4-6 weeks off per year. There was motivators for not taking vacation- profit sharing was dependent on your utilization rate. I happen to have a good reason to take the time (my kids holiday schedule) so I didn't mind giving up extra money for time. I never was approached about my vacation time and felt that I used it responsibly. I can see how some environments could push that into a don't take vacation culture though.