The only thing that WoW added to the EQ formula was the entire questgrind bullshit, instanced dungeons, and making everything 1-cap soloable. On the other hand they didnt include the tons of cool shit that EQ had, like exploration, danger, and the huge non instanced dungeons.
Vanilla WoW most certainly had exploration and danger. There were a ton of un-soloable quests and elite mobs out in the world, hell even a lot of the non elite quests were difficult if you weren't a very good player. All the high level zones starting from around 48 had so few quests you were forced to either travel and explore the entire world to find them, or sit and grind. Once you got to max level the dungeons were so hard you rarely ever did them with fewer than 10 people and the best way to gear up was to explore the world looking for named rares so you could have a chance for high level greens with certain affixes like "Of the Eagle".
Un'Goro, Felwood, Wintergrasp, W and EPL... all of those zones had minimal quests with random caves and weird mobs that you knew nothing about and there was no information on. It definitely had that "I wonder what this is for, am I missing something? I need to figure it out" vibe that EQ had. Especially when you ran into a named mob that dropped nothing and thought "Oh shit, this must be for a quest I missed".
Does anyone else remember original Andorhal? That shit was rough.
What really helped was things like WoWHead didn't exist, sure thottbot was there but the information was minimal and mostly only accurate for lower level stuff. I had to figure out a lot of stuff on my own and actually... gasp... read the quest text. There isn't anything wrong with quests if they engage you, the problem is none of them are engaging anymore. They used to write quests that took you on long pain in the ass journeys across continents and you had to pay attention to what information was given to you because you had to find the shit for yourself. That, to me anyway, was fun but then people stopped reading and just wanted to get to X faster so they stopped writing quests like that and just added a ton of collect and gather quests and put pointers all over your map so you could do it while getting a lobotomy. It's the playerbase's fault, Blizzard gave people what they wanted. Half the shit you guys complain about is only part of the game now because they were originally player created UI mods that EVERYONE used, so Blizzard made them standard. Questhelper for instance.
I personally do not want a grindy game but I would love to see a game with uninstanced dungeons, more group content and no goddamn "daily" anything. No daily transmutes, no daily quests, no daily anything. No weekly quests either, or "point capping". If someone has the time to do it, let them do it as fast as they can. That daily shit is awful.