I disagree that tiling WMs necessarily have a steep learning curve. From experience I claim: Anybody can learn to use a WM like xmonad in its stock configuration in about 30 minutes, and be proficient enough to have a significant boost in productivity in a day or two.
You're right that it's not necessarily steep if you're used to using keyboard commands. But if you're used to doing everything with a mouse it might take some adjusting
