Before I learned lisp, I remember seeing this sentiment expressed a lot and thinking people were underselling the difficulty and overselling the usefulness of "programming your text editor" as opposed to just configuring it via standard options.

After I learned enough Common Lisp to build a few small projects, I realized how powerful it is to write small, bespoke functions for odd text editing jobs. You can write and save functions that do something very specific but powerful to any project you're working on, regardless of the language or tooling used, because everything uses text. I'm so glad I learned it.