I'm not really happy with the way maze rooms are now (large and samey and enemies tend to cluster at the bottom) but I can't really think of a way to fix them.
Perhaps they could have doors that prevent monsters from moving too far from their spawn location, shoot the door to open it. Maybe doors could completely prevent you from seeing what's on the other side, any area that's not connected to the area you have explored except by closed doors cannot receive light or be revealed on the minimap...