I don't think I even got into my bag until discharge, so I really didn't use anything I'd packed. Not my charger, not my PJ's, nothing. In fact, I think I turned my phone off and never turned it on. I might have had some lip balm and I would highly recommend having some, just in case. At discharge, I washed my face and combed my hair, put on some comfy clothes and out the door I went.
Regarding slippers, I had them in my bag but never got them out and I'm glad I didn't. I agree with KCgirl061 above. There's nothing wrong with the hospital socks, even the gowns are tolerable (not fashionable, but tolerable).
My advice: pack light. Make sure you have some stretchy pants/comfy clothes to go home in. Otherwise, the rest is a personal choice. If you feel you need basic toiletries, include lip balm.