I never had a problem w/ having several projects that needed attention. Just couldn't work on them in parallel. I had to take 'em one at a time. Don't get me wrong. Managing several projects is OK but you can only work on one project/task at any given moment.
I felt guilty being 'out of pocket' for a few hours so that I could complete something. Well, thank you Bill Koch! This article at PSJ is reassuring!