I find language to be better suited for imperative procedures. Think about it, I have a list of tasks, do I write that list in ordered English bullet points or do I draw a diagram?
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.
This is pretty much why we've gone with interchangeable representations instead of going "visual only". The choice of the proper tools / representations highly depends on the context, and we want to leave that for the programmer's decision.