Last time I switched was when I was introduced to ctwm (1996), so I guess over 5 years ago is appropriate. I've been using it since then and it works. As a window manager I don't need it to do fancy desktop stuff, which even Debian expects you to do (when I look at the Desktop folder in my home which keeps appearing no matter how often I ditch it)

If it works for you, why change? I see no advantage of all others for myself. Using something different, just because it's there doesn't work for me. When limits of the product or availability become an issue, then I'll look further. (that's why I ditched xfmail a few years back)

Years ago (wow, I feel old now) UNIX environments just had window managers, and all was good. UNIX ran on 'big' systems and the little intel boxes had DOS and Windows.
When Linux cane around, all was still good, as Linux distros were lean (no desktop, just window manager and the tools you needed)
Now it's KDE, Gnome or some other desktop (there's bound to be more now) and the desktop gets messy again.

On my first job, I configured ctwm (yeah, that long ago) and I'm still using it. It's easy, simple and most of all... no clutter of icons on the desktop. Works perfectly for me. To bad I have lots of clutter on the real life desktop. (And I have to kill the Desktop folder every now and then in Debian)

I would say 'missing option', but there's bound to be someone still using DOS somewere in the world. (I reckon he wouldn't read /. tho :) )