Milton Glaser is one of the most famous graphic designers. I've never felt that teaching designers that drawing and rendering were skill sets no longer needed. I have heard professors who say that designers don't need to draw, you have illustrators for that! I've also had conversations with art directors and they bemoan the lack of drawing (thinking, creative thinking, planning) skills among the recent design graduates. Oh - they know their way around computer software, but they are crippled creatively without it .
I know that a lot of you still do thumbnails, and maybe even roughs, and that not all teachers have jettisoned all the traditional tools for the technological ones, but I think there is too much emphasis on the 'cool tools' of technology rather than teaching students to really think, see, and more importantly, listen!, before jumping into a client's needs.
Keep drawing! Keep creatively thinking!