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Latest #Emacs discovery: repeat-mode! I've been using C-xz for ages, although not extensively. If you turn on the mode though suddenly a range of commands can be repeated with much better ergonomics, eg enlarge-window: C-x^, then use ^/v/{/} until done. `describe-repeat-maps' to see available options, plus you can define your own.
The implementation is a bit magical, and even reading the documentation I didn't really know it was there. HT https://tildegit.org/acdw/define-repeat-map.el and corresponding /r/emacs threads for laying it all out.