"sent the keeper the wrong way" - No, the keeper guessed that was and was wrong.
Not always true. Intelligent penalty takers are able to make the goalie think they are putting the ball in the other corner with the way they line their body up, lean to one side etc.
I completely agree with what you say, however it now seems to be the generic response for any commentator, even if the ball is DRILLED and the keeper was clearly trying his luck by diving in a certain direction.
Balotelli sends keepers the wrong way, Van Nistlerooy certainly didn't.