I don't know what your definition of a "moderately complex" program looks like, but I have to say that from my own dabbling with PureData I really enjoyed the w

I don't know what your definition of a "moderately complex" program looks like, but I have to say that from my own dabbling with PureData I really enjoyed the way it handled the concepts of abstraction and encapsulation. It's been long enough that I've forgotten the terminology, but I remember thoroughly enjoying the process of first building a widget, then meticulously arranging all of the little boxes, color-coding, and labeling various sections until it looked visually attractive. Then when I was satisfied, I could take that entire widget and abstract it away as a small box with only the relevant input/output connectors. I guess it's always just stuck out in my mind as the one time I really dug into a visual language, and the aesthetic aspect of organizing my "code" was very appealing. It's been a decade since I last opened any of those old project files, but I can still picture many of the components I built with my mind's eye. In and of itself, that's got to be worth something. I imagine that someday we'll see the rise of a programming metaphor that works as a hybrid of code and visual. Even though working with PureData was inspirational, I don't see text-based languages losing relevancy any time soon. However, I think that while text code is great for representing the flow of logic, higher-order organizational constructs (such as class hierarchies) might be better represented by visual relationships. If I give you a paper and pencil and ask you to map out interconnected relationships between a bunch of entities, you're probably going to start drawing boxes and lines-- and end up with something that looks a lot like PureData. Especially if you consider the potential of future iterations on today's VR/AR concepts, I wouldn't be too surprised if programming languages eventually looked like color-coded interconnected boxes of text code that can be rearranged in space. It wouldn't even be that far-fetched to imagine animations being included to enhance a programmer's ability to visualize the flow of logic. And I don't think that such concepts should be particularly offensive to those who consider themselves to be serious programmers.