I use stumpwm. The reason is to have fewer features. In the few years I've used it, I never wanted to select text with mouse (although sometimes I had no choice, eg. in PDF), but even then, I never wanted to drag it with the mouse (and I never needed to do that). I don't even know if that would work, and even if it doesn't--wouldn't care...

If I didn't need a Web browser and a PDF reader I wouldn't be running X at all... I wish there was a usable alternative for the browser and PDF reader that didn't require X...