Okay, here's a fun one that's been on my list for a while that other people might find useful.  When I have a lot of buffers open, I occasionally want to increase or decrease uniquify-min-dir-content to make it easier to discern, with higher precision, one buffer from another with the same name, and without reloading buffers...

Changing uniquify user options refreshes buffer names.

Use customize interactively, or setopt in Elisp, to refresh buffer names when changing 'uniquify' user options.  Previously, reloading or renaming your buffers (or an Emacs restart) was required.

e.g., (setopt uniquify-min-dir-content 2)

In my init file, I have the following which makes this convenient:

  (defun my/uniquify-dir-content-cycle ()
    (interactive)
    (if uniquify-buffer-name-style
        (progn
          (pcase uniquify-min-dir-content
            (0 (setopt uniquify-min-dir-content 1))
            (1 (setopt uniquify-min-dir-content 2))
            (2 (setopt uniquify-min-dir-content 0)))
          (setopt uniquify-strip-common-suffix (= 0 uniquify-min-dir-content))
          (when (< emacs-major-version 31) ; Hopefully deprecated!
            (my/uniquify-refresh)))
      (message "No `uniquify-buffer-name-style' defined")))

-Stephane