This is a fun move to try and once you practice it enough you’ll find times to use it. I’ve found quite a few times where this is useful. It can be used in a shootout, but also in games when you’re driving the net and the goalie really commits to one side.
Here is the man who made this move famous back in 1994
Here are a few NHL examples of the one handed move
Kopitar doing it to about 5 different goalies
Great execution here
Of course Datsyuk did it