Depends on the context you decide to take it in. I find it to be helpful in chilling out after a bad shot or hole. Stress, particularly mental, just leads to tension which leads to successive bad shots. One could just as well sing the " Barney the Dinosaur " song. Whatever works.
Yes the PGA Tour is a higher standard than the European Tour, and yes Knox has won recently, but I don't think he's that special a player. He's a bit of a journeyman who is having a good bit of form, and not remotely intimidating.
Just as importantly, he has only been a member of the European Tour for a short period of time. He only joined when he thought he had a good shot of qualifying for the team, which is a bit opportunistic if you ask me.