If you're busy, you're doing something wrong (2011)
I think many of us like being busy because we use it as an escape. If you are not busy then the mind chatter will start about that side project you have been ignoring or that career move you have been planning. There is a huge dopamine hit in staying busy in your work and ignore more important things.Btw if you have not read his boom “deep work” then I would really recommend it.