OGB said:

(My Boss thinks I just go find an out-of-the-way table and think Deep Thoughts About Work when I go on breaks....)

That's such a strange phenomenon, but it's a very useful one. My (slightly)PHB has a similar misconception. Since I often come back from breaks with good ideas to sticky problems, he has come to believe that my breaks involve me disappearing to puzzle on Deep Matters of the Project.^* Naturally, it follows that I need to take more breaks. ;-)

*: In reality, I go for a walk by the river (nearby); or, in colder weather, perhaps retire to a conference room (we have no lounge) with a fresh cuppa and my Nintendo DS. It's the relaxation that helps me percolate the good ideas. ;-)