I am starting my transition from Wadauthor to Doombuilder because of Doombuilders ZDoom support. I have been using Wadauthor for about 2 years now. Have you changed editing software like this?
I started out with WADED, the only editor in which I could simply create a sector without all hell breaking loose, but after I moved to XP I had to find something that would work with it XP, and so I discovered Doombuilder... and stuck with it.
Doombuilder has been the only editor simple and powerful enough for me to actually START creating a map. If that's not enough testament to DB's usefulness, I don't know what is.