Not that I've had to do much RPG mapping lately, but I draw maps in my desktop publishing program. (
MultiAd Creator, though new projects will likely be started in
InDesign.)
While I've owned them for years (I picked up a package of most of them in the CC2 era) I have yet to spend the time figuring out Campaign Cartographer and its related programs. It's hard going between the DTP and CAD worlds. :(
Dundjinni hasn't been updated for years, which makes me want to stay away from it. My only experience with it was a very long time ago and I never got it working correctly.