Seems like the comments here on HN are talking about pair programming far more than Mark's OP. The top line of his post was that he prefers to work alone, that the arguments and social overhead of collaborative development have made him unhappy. Pair programming isn't the only way (and often isn't the best way) to collaborate; reading each other's commit messages and talking about them is often sufficient.
And sufficiency is at the core of what makes software development fun and productive: a sufficient number of eyes on the code, a sufficient issue tracking app (and/or other collaborative apps) and sufficient amount of automated test coverage is often all you need.
And sufficiency is at the core of what makes software development fun and productive: a sufficient number of eyes on the code, a sufficient issue tracking app (and/or other collaborative apps) and sufficient amount of automated test coverage is often all you need.