When you’re operating on the maker’s schedule, meetings are a disaster. A single meeting can blow a whole afternoon, by breaking it into two pieces each too small to do anything hard in. Plus you have to remember to go to the meeting. That’s no problem for someone on the manager’s schedule. There’s always something coming on the next hour; the only question is what. But when someone on the maker’s schedule has a meeting, they have to think about it. For someone on the maker’s schedule, having a meeting is like throwing an exception. It doesn’t merely cause you to switch from one task to another; it changes the mode in which you work.
Jason Fried: Why work doesn’t happen at work