That's one trip I've not been on. I've heard that one statement, though, from everyone who's done it, so I'd guess it's a safe thing to say that many have common.
I do have a friend who used to get baked and regale me with the latest thing Roger Penrose or Stephen Hawking have said about the universe, and his and a buddy's latest unifying theories of string theory etc etc etc. He says "Can you imagine....?"
I say, "No. Of course I can't. I'm not baked."
...and he laughs his arse off.