I recently used linked thinking in Obsidian to do some critical meme analysis for therapy. It was a good exercise in creating index notes, e.g. a meme crossing over Marvel and The Good Place wouldn't fit in a folder for either one.
I'm just using emacs org-mode and Obsidian for task management, and keeping track of my learning new code-y things... but no backlinks or anything yet. Was trying Zettlr as well. Waiting for an excuse to get really fancy with it.