I've never "officially" been restrained or put in seclusion. I have been given emergency thorazine when I was freaking out at the psych ward, but both times I "agreed" to take it orally instead of them having to give it to me by shot. I was more a danger to myself than others those times, so they just kept me where they could see me.
This last time I was IP, they had me on 5 minute checks at night, because I sleep with a CPAP and
so they upped my frequency. I only had a roommate for two of the nights I was there, because of the 5 minute checks. They didn't want to put someone in my room and have them not be able to sleep because of the tech coming in every 5 minutes to make sure I was okay.
I have gone to the quiet room before, but I asked to go to get away from the noise or because I didn't feel safe. I was never forced to go there. The descriptions given pretty closely match with what it looked like at my hospital too.
I hate that people have been forcefully restrained and secluded... Sometimes it is necessary tho, unfortunately.