I have 2x 19" at home and love it. One is directly in front of me I do most of my stuff on it, the other is angled to the side and I leave stuff I look at open there, such as a program I'm working on (usually full screen ssh console window).
I recently upgraded to two at work, that helped a lot. I can have my ticket on one side, my work on the other, or open up dslam lookup tools on one, do troubleshooting on other side etc...
Only thing I find anoying is when you open a window in a program it tends to go anywhere on the two monitors so I find myself dragging windows a lot. Like sometimes my email will open on one monitor, sometimes on the other, etc. But that's on any dual screen setup. Depends on the app some remember the last screen they opened on and open there, some don't.