At work, never. None of the guys in my shop use them with any frequency. But we're diesel mechanics, so about 80% of the time we're using flat heads to pull, pry, position, etc. Even though most of my work is diagnostic (not heavy stuff) and I use screwdrivers a little more often (messing with modules, under the dash, etc), I still prefer a normal screwdriver.
Away from work though, I'll use a ratcheting screwdriver if only to cut down on the number of tools I keep at home. I've got a cheap old Stanley that works very well.