Most people feel that printing double sided will save paper, and most times it does. Sometimes the printer gets jammed and your 300 pages are lost in a sea of non papers, which you are too lazy to put back together in order so you just re print it single sided. No jams. Just plain old simple printing.
The only real benefit to come out of double sided printing is the smaller storage area required for all this paperwork. And the number of different versions of the same thing that I work with it is counterproductive to have double sided as you don’t want to be flicking through so much paperwork.