I like a lot of 4GL ideas. Closest I've come was working on ServiceNow which is sort of a really powerful system with ugly, ugly roots but the idea of your code being the database being the code really resonated with me, as a self-taught programmer.

Similarly, Lisp's homoiconicity makes sense to me as a wonderfully aesthetic idea. I remember generating strings-of-text that were code, but still just text, and wishing that I could trivially step into the structure there like it was a map/dict... without realizing that that's what an AST is and what the language compiler / runtime is already always doing.