All Work and No Play Makes Jack A Dull Boy
You know what grinds my gears? Companies that limit the web sites their employees can access. If you don't think you can trust your employee to go to business appropriate sites and use time wisely, perhaps you should find some new employees. Treat employees like children: they will act like them and find other ways to waste company time.
This would mean I'm a horrible employee because I take breaks almost every hour! The catch is that I frequently use them to research web-related topics that improve our work.
I actually had a professor claim that any downtime was abuse of company time. He used the traditional water cooler chat as an example. While this makes sense in an ideal world, it does not in the age of computers. I'm on the computer over 12 hours a day. If I didn't have the opportunity to talk to co-workers about last night's Sox game, I'd hurt myself.
You don't have to take my word for it. A simple google search returns numerous articles, studies, and reports on how frequent breaks (from computer jobs in particular) improves health and productivity. They also decrease stress levels. It's a no-brainer.
So walk down the aisle and recap last night's Jersey Shore with your buddies, read the latest article from Adjacent Concepts, or take a moment to update your fantasy team. Because without "me time" it'll be typewriter time.