If you guys aren't careful, this is going to turn into an essay.
I had a few other thoughts I wanted to share about my own bias(es):
1. I live in an "photo-centric" era. Images and icons are everywhere. I know the faces of people who died before I was born. I know the faces of people who died before my society developed. I know the face of Epicurus, himself, down to his cheekbones. But ancient Greeks, in terms of realistic representative art, were limited to statues, and they were usually either civic or mythological. Most grandkids did not have busts of their beloved grandma and grandpa on their mantle. To spontaneously witness the form of a 20-something friend during "dream-states" at various points in one's life would have been much more significant to a non-"photo-centric" world.
2. I live in a prohibitionary era with regards to psychedelics. Most of us do, and most of the modern world is characterized by prohibition in some form at some time, albeit trying to demonize Gin in medieval England, to American zealots trying to ban Peyote ceremonies from native rituals. The suspicion of psychedelic chemicals is ubiquitous, and is utterly prohibited from children to the extent that we attempt to censor information. The point is, the average ancient Greek was not exposed to "Reefer Madness" and "Just Say 'No'" and would have seen been more likely to associate religion with the state of divine intoxication and the rituals used to induce it.