Yes! Recent personal hacks with advice interactively programmed with the help of Claude 4.1 chat session running in Emacs.

  - popping the global mark to travel backwards to previous edit points would reuse the same Emacs window instead of using a window that is already showing the buffer. Fixed
  - I would accidentally destroy my window configuration w/ C-x 1. Fixed, use advice to automatically save the window configuration into a register if I invoke the command to remove all other windows. Now I can easily recover if I make that mistake.
  - I want to be able to select and then scroll any other open window w/o leaving the current one. Fixed
  - A crazy one. I collect note w/ links or whatever for reading/watching later, these are marked w/ a timestamp. My notes file is not an agenda file, i.e. not filled with todos / tasks. I made a hack to temporarily include the current non-agenda org-mode buffer in the agenda list and then show inactive timestamps. Now I can scan a day/week/month for interesting notes I took. This doesn't interact at all with my real agenda.
  - org-agenda opens items in weird places, use advice to fix it so that it always appears where I like.
  - fix inf-clojure so that it uses dep.edn as project root over .git

I used IntelliJ happily for 10 years (I was a heavy Emacs user for 10 years before that). While it's true that some things are a little less convenient (I don't use LSP), knowing that I can tailor things exactly to my tastes is a serious breath of fresh air.

It used to be I mostly used IntelliJ for work/OSS and Emacs for org-mode. Now the situation is likely reversed. Emacs for work/OSS and IntelliJ only if I need step debugging/global refactoring.