I think what it boils down to is that these techniques FEEL safe and effective. Corners are scary. Straight line speed is one thing, but add a corner to it and the fear goes through the roof. Well, if speed is the monster, then the brakes (and decelerating by being off the gas) are our salvation right? Fortunately someone has taken the time and effort to show that this really is not the case. I must admit I was a bit of doubter when I first heard of the school as well, but there really is no arguing with logic and data. It just works, it's got data to back it up, and it's not based on someone's feeling.
Some of the techniques I've read about in magazines (I was a big fan of that particular column as well) seem to be either racing technique mis-applied to the average street rider, or as I opined above, based on someone's feeling on the subject. I agree with LeftLaner that it's all about who you choose to listen to.