Hi, I found it ok to work with shaders in Processing. Only that you can’t use the Processing IDE to edit them. I made a tool to make it a bit easier.
Then OPENRNDR is the only environment I know with shade styles, which let you add shader effects with one line of code.
What you can do with shaders is more or less the same in all environments. Ok, some may let you add your own attributes to vertices, some provide Compute shaders… but the basics are the same.
I think I should really record and put my shader workshop online 
Would you be interested?