Unfortunately, most visuals you'll get of the populated canvas online are crap. And for those of us who make extremely clean readable programs it's kind of a superpower and we tend to be careful with how widely we spread them. But once you see a good one you get the value immediately.
Here's a good simple program I made, as a sample. [0]
Also, I want to give a shout-out to the Future of Coding community in this. The Whole Code Catalog [1] and Ivan Reese's Visual Programming Codex [2] are great resources in the area.
I also have to mention, despite the awful name, Flowgorithm is an EXCELLENT tool for teaching the fundamentals of procedural thinking. [3] One neat thing is you can switch between the flow chart view and the script code view in something like 35 different languages natively (or make your own plugin to convert it to your language of choice!)
p.s. If you are used to regular coding, Grasshopper will drive you absolutely freaking bonkers at first, but once you square that it is looping but you have to let the whole program complete before seeing the result, you'll get used to it.
[0] https://global.discourse-cdn.com/mcneel/uploads/default/orig...
[1] https://futureofcoding.org/catalog/