I find simple math to be much more elegant and easier to comprehend then a jumbled visual diagram. It's much easier to understand a universal quantification in a standard notation than reasoning by visual analogies.

Programming languages tend to be a little less expressive and elegant. They're more complicated too. For reasons of course... but I don't think I'm going to be writing algorithms and data-structures in such a tedious notation as a diagram.

Graphics are good for some things but programming I don't think is one of them.