I still use it now and then. And use the old Norton stuff like TS.exe (Text Search) more often than that (just try doing what it does in Windows). Not to mention NCD.exe (Norton Change Directory ... and its clones, like ACD and WCD). I still use DOS Navigator, too. The great things about all the good old DOS stuff are that they're quick, fully developed, and (these days) they're all readily available off the web for nowt!
And the real cruncher about DOS and the DOS Commands (isn't that the name of a group?) is that, if you knew a bit of C, you could always write your own!