The truth is - people think in text. Visual abstractions are only suitable for a tiny subset of things we're thinking about, and the rest is just too complex to be expressed in anything but a natural, complex language.
We always think in code. A plan for a day is a code (and nobody ever use graphical diagrams for it). A cooking recipe is a code (plain text, never a diagram). A legal document is a code (I wish some of them were diagrams, but a plain and unobfuscated English would have been even better). Pretty much any form of communication is code. A one-dimensional sequence of words.
Yes, the existing coding languages are crap, they are simply not abstract enough and not flexible enough. And this is what must be fixed. Representing the same broken abstractions, but this time in 2D diagrams, won't fix anything, or even make things worse. Been there already, with flow charts and all that.