For some of us, we turn it into a hobby. Only difference is that the technical knowledge and experience gained at work, can also be applied at home. (without a lot of restrictions).
If your personal life is filled with productivity tools and optimizations, at what time in your daily life your are _not_ worried about productivity? If this time is zero, I think it's kind of sad and maybe even unhealthy. It's just my opinion, of course :)