You generally use the keyboard with the mouse then you don't have to use the menus all that much. I got a 1 min vid here putting down a few rooms, a few doors and some notes on a grid. No menus were needed at all. Still, I accept that its not for everyone. I didn't think DungeonForge was that buggy but I haven't used it in anger. Gimp and PS will definitely do what you need but I think its more restrictive once you have made the map mitigated somewhat if you have all the different stuff on multiple layers.

SimpleDungeon