I believe Windirstat is basically a direct port of K4dirstat, though I've found the outdated interface and KDE dependencies frustrating. I discovered Baobab has

I believe Windirstat is basically a direct port of K4dirstat, though I've found the outdated interface and KDE dependencies frustrating. I discovered Baobab has a similar box visualization available via an easy-to-miss icon at the bottom of the window, in addition to the default pretty-but-not-very-useful ring graph. Unfortunately both have the major shortcoming of not including individual large files.