My father taught himself postscript in the late 80s (it was on the Mac SE). With it and Microsoft Word with a "secret" PostScript style (a particular combination of font, size, italics, underlining, and hidden) allowed him to create a high quality header for a Microsoft Word doc.
With it, copied that document and printed it and the university's letterhead was nicely at the top - scaled to any size. It worked just as well on 8x10 as it did on cardstock that was to be sent out.
It cut down on the cost for printing for the department because they didn't have to buy as much of the letterhead pre-printed paper. Saved on time too since you just printed it rather than needing to load one special sheet and then print the rest.
He saved the stack of paper that he used to learn with for a while. Got four tests per page (four edges and flip). The red book for PostScript laid on top of it.