I couldn't say it better myself, so I'll let Milton Glaser say it.
Notice, he's drawing as he speaks, but it's not, "Look at me draw this thing that you couldn't possibly draw and I'm so good at this..." but rather, "Here I am thinking out loud."
The rest speaks for itself. I especially like how he points out that art schools seem to think that they need computer programs in order to teach drawing. Please.