I'm aware that Purgatory isn't scriptural, and the community I was raised in believed a lot of stuff that wasn't found in the Bible. (It's one of the reasons I left.)

The point I was trying to make there is not "What is Heaven according to scripture?" I was speculating what heaven would need to be for me to consider it a paradise. And the answer I came to is that no place can be a paradise as long as I'm in it. Not because I think I'm a bad person, but because I have so much trauma and other mental baggage that I would be bringing with me. I would be too suspicious of a place with nothing bad in it to be able to enjoy it. I would unintentionally hurt those around me because of the pain I'm in. And those people would hurt me, and each other, because how many people actually manage to reach a state of complete emotional health before they die? No one is ready for paradise.

There would need to be a place and a time for healing the traumas of life before we could enter any kind of heaven. For this I borrowed the name Purgatory, because it seems to me a similar concept. And maybe the person who emerged from such a place would be so different that you couldn't really say they were me anymore, but I think I'm okay with that. I don't want to stay the person I am now; I want to become something better.

I guess that doesn't have much to do with your original point about people not understanding eternity, other than being in agreement that it wouldn't be a fun thing for humanity as we know it.