When I keep my laptop and my mobile phones switched off, even for only one day (it happens, maybe, six times per year!), I feel like I am an hero!
My company could run even if I'm not at work but... I love what I do (and fortunately my partner loves the fact that I love what I do!). So said, twice a year we spend a couple of weeks on holidays. In that way, I can recharge my "batteries" and come back at work reinvigorated.