"The two or even ten minutes you spend not using your PC are not lost. It could be a unique occasion to talk to your colleagues, it could be time well spent cleaning some papers."
I think that is true if you control when the reboot happens. If it just happens then it might be at exactly the wrong time.
If you control when the reboot happens, you will plan something for it. What I think is absolutely necessary in our lives, even for those at Google, is a significant amount of unplanned events, unexpected experiences, or any other occasion to prove to yourself, to feel deeply inside, that you are not a robot.
Maybe it is personal, maybe it is cultural, or maybe it isn't: I don't like (an understatement) fully planned trips where you are told "the 8th of July at 10:45, you will get an artistic ecstasy in fron of the Taj-Mahal, the 9th [...]". I won't work on anything that has no risk to be hard to control and nothing unexpected can happen. I don't mind if my PC has to be off for 10 minutes.
("Disclaimer": I live in China, not in Switzerland.)
I work as a teacher. I can plan lessons as much as I like (and today I'm planning for an observed lesson next week or week after) but I can tell you, something unexpected always happens in the actual lesson. The plan lasts 20 minutes if that. The rest is 'reflection in action' to quote Schon.
I think that is true if you control when the reboot happens. If it just happens then it might be at exactly the wrong time.