I’ve been there too.
When my friend was considering going to the chapel of rest I had a very frank conversation with her about it - mentioning how people who have passed actually look, at that point, to try and prepare her if she chose to go. It’s one of those things where you only get one opportunity to go (or not go) so the decision really has to be the right one. She went, thought she was prepared, and hated it.
I’ve been twice. Once was for a really traumatic death when I found a relative dead who was previously healthy. My parents were adamant it would bring me closure. It didn’t. It made it worse. However, I never think about it now really, years on, and when I do recollect it, it isn’t embedded as a traumatic memory anymore. I guess that’s the passage of time.
The second time was more accidental - I’d agreed to go to the chapel of rest to support my mother after the death of my grandma but not to go in the room. I literally took a wrong turn going to the bathroom and the door was open, so I went in. She looked peaceful. Happy even. That was a much more pleasant memory than the last, and not at all traumatic.
My grandad passed soon after. My family expected me to go to the chapel (it kind of is an expectation in our family, culturally). I declined and don’t regret it one bit.
I don’t think I’ll ever go to one again. On balance, it’s not something you really need to see.