SolveSpace looks exactly like the sort of "user-unfriendly" tools I build for myself and am absolutely personally productive on but would never release to the general public. Maybe I need to re-think this ;)

That said I'm getting back into GUI editors. Anaconda for research computing. And Atom for text and code. Including Markdown.

The advantage is Atom's module system. 5000+ third-party creations. Including really edge cases. That, I believe, is due to the reach of JS/HTML/CSS.