I downloaded and installed the free version of Bryce 5.5. It was mentioned in the OpenGL-ticker I have on the left side, you have to get a serial number from daz3d, when you install the program it will ask you for it. You can get it from www.daz3d.com/bryce55, you will have to give some personal information. I played with it a tiny bit today. I have to admit I was curious about how the height maps are created and found the same terrible stuff I also have in my program. Basically you can paint them or use some fractal algorithm to create them. After you created the base map you can then modify it.
The tools are more elaborate than mine, but they feel equally clumsy. It doesn't seem possible to describe where you want to go apart from drawing the map. The fractals and the modifications all seem to have that problem that you can't really work in a direction. You can apply them and try to discover something you like. But I don't see how I could create a set where I have a rough outline in my head with them.
I will play some more with the program, you never know when you stumble on something which might be a good idea to implement. But I want my program to be able to compete with Bryce in the long run, so I probably won't use it for images. Probably, because should I get something nice I still might post it.