As mainly an MMO player, the place I was first introduced to the concept of "Hardcore vs. Casual" was on the Forums where "Hardcore Gamers" would complain after every patch that the game was being nerfed for the "Casual Gamers".
Back in the day, they had 120 man raids that took 3 weeks to fill and organize to kill bosses that had more HP than god and took 8 hours to kill and that was only if some Leroy didn't screw it up and cause a raid wipe - then it took 12 hours assuming half the raid didn't ragelog or have their parents tell them it was time to go to bed. They liked it that way and anyone who didn't was obviously not taking the game seriously enough.

Back in the day, they had 120 man raids that took 3 weeks to fill and organize to kill bosses that had more HP than god and took 8 hours to kill and that was only if some Leroy didn't screw it up and cause a raid wipe - then it took 12 hours assuming half the raid didn't ragelog or have their parents tell them it was time to go to bed. They liked it that way and anyone who didn't was obviously not taking the game seriously enough.