Psy is a very great performer and entertainer. Despite not being a fan, I always enjoy watching his live performance and on TV show (his fantastic duo stages were legendary)
If I remember correctly, Gangnam style also took a while to hit viral too.
Yeah Psy is an amazing performer. The Sungkyunkwan University performance looked insane - the crowd was going absolutely wild. No doubt his performances and their virality play a part in his songs becoming bigger hits. It's interesting to me though that he didn't start with very high initial ULs (unlike how other anticipated, well-known acts start off with massive numbers before dropping to a respectably high plateau) since he's a big name, had Suga producing and featuring, and I would've thought there was hype because of the long time between comebacks.