I like my vacations better this way. Humans are built to adjust to their situation. It benefits us, from an evolutionary standpoint, to stop enjoying ourselves and start looking for potential enemies. So in that sense it doesn't matter to me if my vacation is interrupted.

So I can't do three week vacations. I take three one-week vacations interspersed with (on average) a day or so of work. I find I have more fun that way anyhow.