The Creative Applications-blog has got a very good read about good ways to organize visual patch programming languages like vvvv or maxMSP. It deals about top-down and commented vs. chaotic and almost non-organized. It talks about levels of complexity as well. The article talks also about aesthetics. Sure, if we are honest, we all foremost like patching languages not only because the are handy, but also because they most often look extremely pleasing to the eye.
