I thought I went through a lot of paper when I was a student, but since joining the masses of poor corporate drones, I've discovered that what I previously thought was "a lot" really, really wasn't. Think printing 500-page documents, eight copies at a time, and then discovering they're wrong and need to be reprinted ... and then having seven more copies made for the other party ... and I'm only one of hundreds of peons doing the same thing, every day, every hour.
I am a lot more relaxed about paper use at home these days. There is no possible way even the most wasteful calligrapher could burn through a fraction of the paper big corporations use - the environment would barely notice if I was doubling my use.
(But I hoard scraps of Arches 300gsm and Canson Mi-Teintes because I'm determined to get all possible use out of them. Those are expensive, and so nice to write on, and I can always make calligraphic bookmarks and gift tags with cutoffs!)