the break does indeed apply to everyone in the team, that includes the guys in the windtunnels who work shifts, and the people in the offices who don't.
bear in mind that it's most likely to be compulsory leave to be deducted from their annual allowance rather than additional leave. once you factor in christmas, which usually has a couple of days shutdown (again, deducted from annual holiday allowances) it doesn't really allow much flexibility.
you try and take your holiday when you're obligated to be at a circuit for 5-7 days at a time, 19-23 times a year. you can't just get someone to cover for you like in a normal job, it's very difficult to fit it in!
interestingly, many uk and international series have taken f1's cue and have a 4-8 week layoff in the middle of summer.