Keep on the Borderlands was my intro in 1983. From that moment, through my visit to Gen Con '88, I was hardcore. From checking the Holmes set out from the public library, to owning every 1st edition hardcover and meeting all of the big names (Gygax included), I was there for the boom. Then I quit, cold turkey, for decades.
I've finally felt drawn back, very recently, but only to the roots of the game. Even though I have both Basic sets and all my old 1E stuff, I just can't get too excited about them. The White Box has been calling to me, and I finally picked one up, along with Greyhawk, Blackmoor, and Gods, Demigods and Heroes. I've also ended up, somewhat by chance, with the Arduin trilogy, and the City State of the Invincible Overlord. Eldritch Wizardry is the only really essential piece I still need to grab. Well, that and ideally the map from Outdoor Survival.
Pretty excited to delve back in, and resume my DM status after so many years away.