When it is a visual notation and the main purpose is that it is supposed to aid you in thinking, then I think being "intuitive" is one of the most important fea

When it is a visual notation and the main purpose is that it is supposed to aid you in thinking, then I think being "intuitive" is one of the most important features. I want to see a graphical representation of my "business" entities, not a more verbose 2D representation of my source code.