I have really fond memories of EQ. I was pretty young when I started playing (Wiki tells me Luclin was '01, so I would have been 11... wow.) and yeah, it was really great. I played VERY casually, as you can imagine. I had a really great guild called Arbiters of the Apocalypse who were one of the launch guilds on my server and it was all just friendly and cool.
RP was kind of more incorporated into the general flow of the game. People took things very seriously. My GM had his character married to his wife's character, in game, near a waterfall in Rivervale.
Kinda weird imo.
Also, you didn't so much "quest" as you did run to a zone, call an LFG, get invited to a group and then farm until your eyes bleed.
The auction system initially was great. People would call out for buffs in PoK (where everyone hung out) like Spirit of Wolf for faster travel... or the one that makes you float as well, which I can't remember.
I remember that each class would have an "epic" weapon, for which you needed to do a crazy long quest and it took forever. Looking back on it, they looked pretty terrible but hey... It was all about status I guess.
Oh, and there were hardly any item level requirements. People would twink out their level 1 char with stuff that a level 50 could have been wearing, which was kind of hilarious.
Ah, fond memories. - Oh and SURNAMES. I want a surname bad.