Not sure what to tell you then, since I've never had it not work.
If you tap the command quickly it should happen immediately without even bringing up the app switcher, and if you hold cmd and tab through the app switcher it does the same thing when you let go:
If you tap the command quickly it should happen immediately without even bringing up the app switcher, and if you hold cmd and tab through the app switcher it does the same thing when you let go:
https://streamable.com/pn8rjb
Video recorded on Big Sur beta, but I'm sure this behavior isn't new.