Yes,
Window Maker is a very fast, lightweight and NICE window manager, if you like docks, like I am, then Window Maker is your WM of choice. Also it has poor(many useful features are disabled by default) default configuration and outdated default theme, and I believe that's why it's not so popular. But it can be configured (btw, all configuration can be done via GUI app (WPrefs), no need to edit configs by hand) to be very nice and very usable. Also you don't need panel with tray with
wmaker, because there are many dock apps for it in ports tree, like volume indicator -
audio/wmsmixer, clock -
x11-clocks/wmclockmon, calendars, disk/cpu indicators... etc. Just give it a chance and use for few days, you'll love it.