I did in language courses, but not in others. For math/CS courses I've found old books with dozens of pages of engineering paper stuffed in them, however. Probably the same sort of content you write in the margins. Paperbacks also lended themselves better to making notes within the text for me, but that was a psychological block (expensive hardback? keep it pristine! cheap paperback? meh, who cares?). I'm mostly over that now.