Yeah, not quite "visual programming,' but there is a similar argument to be made about a program's user interface and how its design suggests it should be used. At this point, that's probably a far better explored area than the same aspect of visual programming.

That said - Rhino is one of the exemplars in this area. I always tell my students - if you don't know what to do, just start typing. As you say the relationship of the graphical command processes and the CLI is stellar.

But - one big shout back to Grasshopper that NOTHING ELSE compares to - if you hold "ctl-alt" and click-hold on a component on the canvas, it opens up the library tab where that component can be found and puts a big arrow pointing to a big circle around it. It's one of the most shockingly useful commands in any program, ever. I've had rooms of students audibly gasp when shown that.