I grew up with this animation so I didn't consider it annoying until I bought a new Macbook a couple years ago. I noticed sometimes I would press keyboard shortcuts before my system's focus had switched. Just little stumbles here and there, some inoffensive, some annoying, but who knows maybe I didn't catch enough sleep. Over time it happened often enough that I decided to google it, and it turns out my muscle memory…
Wow I never realized I had this problem until now! I never even considered the reason keys would dispatch to the wrong window was because of the animation. I just knew that sometimes when switching workspaces I'd have to wait until whatever window I'm switching to has focus before typing.
https://github.com/mathiasbynens/dotfiles
And here's the blog of the person who ran MacOSXHints.com:
https://robservatory.com/make-your-macos-dock-suck/
Fun aside, I'm pretty sure that my mention of a system issue that I read about that morning on MacOSXHints.com was a helper in landing a job in an interview that afternoon. What I mean is, I said, oh are you talking about "whatever thing on that site today…?" and it demonstrated that I was familiar with whatever internals.