I've a similar zen in moving from a 2-monitor desktop setup to working off my 13" MacBook Air. It's been a huge benefit to my productivity. I make heavy use of Spaces, so when I'm engrossed in a task, it's all I'm doing. I'm also pretty ruthless about closing windows/tabs and quitting apps, so I typically don't have that much stuff running at any given time. My overall stress level day-to-day has gone down significantly, and I attribute a large part of that to the amount of clutter I've removed from my average context of operation.