This is interesting. I ctrl-f'd for "self-doc" because I was wondering when we will start seeing Terraform, Puppet, etc., have options to generate a diagram automatically as part of their normal operation. Self-documenting infrastructure would be a godsend. My organization is challenged by the lack of documentation of our infrastructure, especially.
edit: Most of the responses to the original post seem to be addressing the idea of understanding code through diagramming. I am _much_ more interested in understanding complex infrastructure through diagrams. What queues do we have, what are the producers, what are the consumers? Where is the database? What writes to it? What do we shard on?
Code's a lot slipperier to autodoc, and the slipperiness is a function of number of contributors.
Infrastructure, however, we have been herding (pun intended) to a more declarative, predictable paradigm for years which is great. So let's start building the auto-documentation stuff into e.g. Terraform, since infrastructure-as-code seems like the natural place for such useful side effects of provisioning assets.