Although I would agree that the original concept of the tour--seeing the actual animators at work--was superior in my viewpoint, I find that I really enjoy the cartoon drawing lesson. I've done it several times, and it's fun and yields surprisingly good results. I do find, however, that it depends on the animator teaching the class, as some go through more details and explain more for a better-looking picture.
The annoying part is that it only runs every half-hour or so, and there's no way to know what character they're going to do, so you can often wait a considerable amount of time to find yourself drawing the same thing again...