Interesting comments -- after 12 CSS sessions, I did a 3 day spencer course, just finished it. In the classroom we got to watch films of Spencer's GP races, and man you should have seen Randy Mamola railing around corners with his outside leg totally off the bike. Sticking out in the wind, practically! I don't know how he stayed on (well, he did go off track a few times . . .)
I don't want to get into the whole body steering/countersteering thing -- you know Nick Ienatsch and Freddie teach no countersteering, all body steering. I will say that all the braking drills and trailbraking practice indeed had me carrying higher speeds into the corner, but braking with a much lighter touch than ever before, even though I was braking harder. Somehow I doubt that I'll ever stop countersteering, though! I will also say that there is a lot of stuff that you can do with your body position when you're hanging off that seems to affect bike direction, but at that point I've already gotten the bike leaned over.