First, it's difficult to google/copy-paste. Second, it just goes against the way I learn new programming languages - I generally read it, then try it, then experiment with it in some other ways, list few pages back/forth, experiment more, fail, then continue. Usually copypasting/rewriting chunks of code. "What happens when I do THAT? Oh, it fails miserably. Why? Oh, that's why."
I can easily reread some parts. I can easily skim back/forth. While with the video, I don't want to hear the person more than twice, usually. The voice becomes annoying for the third time you hear it.
I feel that videos work great for demonstrating a language. I can never actually learn any language from a video tutorial.
(If you will bring the analogy of lecture - yes, this is partly true, but good lectures should be somehow interactive. The lecturer asks students, they can ask the lecturer back.)