I quit a job when I felt burnout developing. The cause? Pair programming. I just cannot that close to someone for the majority of the workday without feeling constant low-level stress and annoyance, and I can't focus and think about problems in that setting. When you have to sit in your car for 15 minutes every morning just to summon the resolve to get out and go into the office, something's wrong with your work envi…
And I actually like pair-programming, some of my best code was written with somebody sitting besides me and we have solved some really tricky bugs like this.
But we tend to do this only rarely. Most of my day is spent organizing stuff and reading emails anyway :-)