I was shown the magic of Dungeon Builder yesterday by Thaddeus and I was blown away by the sample map I was shown. So, I downloaded the free demo and I put together The Dungeon Privy shown above in less than half an hour. That included time to learn the basics of the program.
This morning I tried my hands at the demo again, this time for an outdoor map, and again I was extremely impressed with the results. Again, the map was completed in about half an hour.