I agree it's possible to plant a seed and start it growing in an hour or two, but that doesn't work for everybody. At ECES 2006, I heard some feedback about the provided lessons. Many people thought they were wonderful, but I also got some comments that some more "practical" tips would be appreciated, and that some people had a hard time getting their head around the theory.
I'll never forget when Erik grabbed me on the hill in I think 1992 and said hey, on heelside, try putting your rear elbow on your front knee and holding it there. And on toeside try grabbing the back of your rear boot cuff with your front hand. Of course the intention was/is not to ride this way all the time, but these two simple drills changed my riding and got me past a plateau upon which I was stuck.