In 1980, John Eric Holmes, editor of the first Basic D&D book, wrote this article for Psychology Today describing what it was like to play RPGs. I think it's a priceless historical document, giving us a first-hand perspective and analysis of what "old school" gaming was actually like.
Why is a D&D writer getting articles in Psychology Today? Because he's also a practicing physician and associate professor of neurology.Confessions of a Dungeon Master
I read it back when it came out in 1980. The image of the player characters seeing one of the DM's loving creations and walking away, uncaring, has haunted me ever since.
(spun off from the Moldvay/Mentzer thread)