I've always been the same way - most screencasts move too slowly for my tastes and don't hold my attention (that's why I was impressed with the navigation system in these videos).

When I was approached to record a series of jQuery screencasts for TekPub, I almost passed because I didn't personally see the value of video tutorials. However, having done it and received voluminous amounts of positive feedback from people who finally groked concepts that had been eluding them, I've come to realize that different people simply learn best in different ways. The success of Kahn is another good example of this.

I don't think that makes a video-learner somehow inferior for having approached the topic in a different way. It just means that they best absorb content in a different way than you and me. Often, when I hear from people who watched my videos, they're asking for pointers to more advanced content on the same topic, so they can continue building on that foundation. I think it's inaccurate to cast them as being "spoon-fed" and assume they don't pursue deeper knowledge.