I still haven’t found a practical use for it.
This morning, my watch alarm went off. Tried to double-tap to turn it off. Since my watch is still in Sleep Focus, the screen doesn’t turn on, so the double tap doesn’t register. I had to press the crown to turn the screen on, and then the double tap worked.
During a workout, a double-tap to pause would be nice. But no actions register during a workout.
It’s gimmicky.
Not sure why you would want a double-tap to pause a workout. The reality would be there would be so many accidental pauses your workout won’t be tracked properly.
I use Quick Actions as I’m on Series 7 but for me the benefits have been: closing notifications, playing and pausing music, taking photos without needing to look down and press the button, stopping timers and snoozing alarms.