WindowMaker, then FVWM were my drugs. I used tiling window managers for a while, when my typical workstation was a laptop, but now that I have a large-ish screen (27") on a desktop they're pretty bad -- everything is either too wide to be useful, or too narrow. Ratpoison was definitely my favourite (I also use Emacs, figures...), but I liked wmii, too. By the time I ran into pwm I was hooked into Ratpoison :).

LXQT does its job for me these days. It's not the most polished but at least it doesn't go out of its way to make my desktop look and act like a tablet so I'm happy with it.

I've been toying with writing a Wayland compositor that does wmii-like tiling, but can also do proper floating window management, but I have to wait for things to settle on the Wayland front before writing anything that's useful...

Edit: whoever downvoted you clearly never had a few hours of fun on a Friday night tweaking FVWM only to find out it's 4 AM now and oh crap it's also Monday!