I don't have a problem with generating diagrams from configuration and/or code (e.g. with Graphviz) but I'm not keen on diagrams actually being edited and used to generate stuff. However, I would say that my aversion isn't based on a fundamental problem just on my experience that "graphical" tools are often awful from a usability and practicality perspective so that the benefits never seem to clearly outweigh the significant issues (e.g. compare diffs of text files with diffs of diagrams).