I don't use SNS either. Mostly because I make lagers more often than ales. I crash cool the starter prior to pitch, so SNS won't work. I crash cool to drop the yeast out of suspension and to drop the temperature of the slurry to avoid thermally shocking the yeast. The shocking of the yeast isn't a too big of a deal, but lag times times are greatly increased. Another reason I don't do SNS is I'm often not home when the starter is going, so there is no one there to shake it. I'm not sure why people say it's easier, I also use canned wort and a starter is put together in 15 minutes or so, so I don't see how it could be easier or faster. Much of the beer I make goes into a competition and I win more often than not, so I don't see an improvement on the overall quality of the beer.
I do see it as a benefit for ales, pitching at high krausen does work. It reduces both lag times and the required pitch rate. As far as who came up with it or getting credit for it, I'm sorry but a lot of people come up with great ideas and give them away. It's called a homebrew club meeting. When ever I come up with a new method or technique, I have to admit someone somewhere gave me an idea or inspiration to do it and I owe them a debt of gratitude.