Agreed, I've met one of these people and discussed this trait with them. He described it as an obsession, something resembling OCD that he was literally unable to function, or would go crazy, if he didn't sit down and do the work his brain was forcing him to do.

Before we talked, I was jealous of such people. Now, I consider myself lucky to be free from that burden. Life is all about tradeoffs, nothing is given without taking something else away.