I don't know blueprint, but I'm wondering if after some time using it you begin to pick up patterns from looking at zoomed out code. One thing that strikes me is that each of these "nightmare" examples has a very definitive and recognizable form. There are certain structures that one can pick out and recognize between diagrams. It reminds me of being able to discern nested loops and long switch statements in traditional text code minimaps. It might be the case that these code maps look like a spaghetti mess to the untrained eye, but the variety of structure in the code allows skilled developers to zoom in on a bit of code the way you can zoom in on your house in Google Earth without any help.