Justgotosleepnow I think the folding not hanging thing is based on v small Japanese 1-room flats, where space is at a premium. If you have enough hanging space then why not use it? Artificially buying drawer type storage (unless it would bring you joy) seems a bit pointless to me.
After Konmari-ing my tops I ended up with ~10 long/medium sleeved & 4 short sleeved t-shirts & 4 hoodies & I rebelliously hung them up again - along with about 25 spare hangers I'd liberated! I can see what I have and the clothes are organised from heavy things/colours on left to lighter things/colours on right, to be uplifting as KM suggests.
Everything is neat & organised & I can easily see everything & choose what to wear. I can't see that putting them in a drawer would help with anything.
pjs, underwear & trousers are folded in drawers as she suggests & for the dc (who have no hanging space), folding their clothes into drawers in rows (instead of piles) has completely changed my awareness of what they own and has meant they wear a wider variety of clothes rather than just what was at the top of the pile, which is great! :)