I do. I don't think it NEEDS to be folded, but after reading Marie Kondo's book, the only "category" of stuff I managed to tidy up was my clothes, and I followed her advice for how to fold stuff when I reloaded/reorganized my dresser afterward. I love the look of my two columns of underwear all folded into little packets, so I've kept it up. (Along with folding everything else, but with other things I do sometimes get sloppy with how it gets shoved into the drawer.)