That's just one example because it just happened, but this happens ALL the time. I know Apple can do better. My Android phone felt so much more responsive (the 120hz screen helped, I'm sure), simply because the animations were snappier.
Other examples that come to mind real quick:
- Swiping up to switch apps. That one is awfully slow. (Actually, most gesture-based activities are painfully slow!)
- Dismissing notifications (esp. on Mac)
- Opening the drawer thing
- Revealing the dock
- Sometimes I see animations stacked upon each other. One animation has to fully complete, then another one, THEN I can finally use my computer again.
It's ironic that I have to go to Accessibility settings and disable these things to make my device accessible.
Siri can be in the middle of responding to a request from my phone when I dock it to my Magsafe charger on my desk, and it obliterates the request like it never happened. Also, cannot use the phone for about 3 seconds after docking it. The green "your phone is charging!" animation takes precedence over all.