for a long time I've believed that the way to bridge the visual and the textual worlds is to generate the visuals from a plain text source of truth. I've never gone so far as to make a visually editable programming language, but I have done multiple projects where, for example, process diagrams in an IDEF0 style were generated from human readable text propositions of the form:

Prepare Meal is a Process Oven enables Prepare Meal Utensils enable Prepare Meal Prepare Meal transforms Raw Ingredients Prepare Meal produces Finished Meal Menu governs Prepare Meal Customer Order governs Prepare Meal

You can map out a business process using a very simple (and XML-free, and diffable) plain text DSL and generate interactive diagrams from it. My most recent example is for concept maps along similar lines.