I'm not saying that vanilla was perfect and better in every way. Balance was one of the major issues, I do agree with that completely.
Having to walk to the dungeon is one of the key things that were removed. It heavily damages the whole "one big world with many other players" aspect. So do flying mounts, by the way. The whole premise and concept of an MMORPG is "there's one big persistent world with many other players you can meet and engage" - well, you don't get to encounter those players or interact with that world if you can just fly 11 kilometers in the sky and/or just get teleported to the only isolated locations (instances). The whole game is reduced to just going from point A to point B on the map and doing shit. The world becomes optional, which goes against the core concept of the game.
What I meant was that to see the content (i.e. dungeons and raids, and even the group quests which existed in pretty much every zone - there's much less of those now; there even were 5man quest arcs, remember EPL quests?). There was only one way to do it - go out of your way and find people to play with. It could be channels, forums, finding a guild, friendlisting people, recruiting on trade chat, talking to people on the realm forums, talking to people on arenajunkies, joining IRC channels for realms/battlegroups, etc. But you had to actually do it yourself, you had to find a way to connect - that's why we created all these communities in the first place. Currently you can witness all of the games content via LFR which you can do with literally 0 human interaction, and the premade finder which simplifies your interactions down to "if it has enough ilvl/rating/achievement -> invite" in most cases. You interact with the UI more than with people - and I've Heroic pugged entire Legion myself.
The thing that got me into PvE originally is that I wanted to see the content. Nowadays the only reason to do it is to see your characters numbers increase, which isn't that much of a drive really. It was an adventure, an adventure that was shared with another 20 or 25 or 40 people or whatever - and that's the whole spirit of an MMORPG to me. Any kind of automatic matchmaking is vandalism, and even the (albeit very convenient) premade finder is an abomination.
Once again, of course some activites required a group, i never said that the entire game is a solo experience. I just said that everytime people argue for Classic (Which they are totally right to.), they mentioned the "The game forced you to do as group.". And this is false. False, false, false.
Not a single time the game FORCED you to group.
And going to point A from point B is ironically what was Vanilla. Because in order to form a group, you needed to stay on the faction hub (Orgrimmar, on the bank roof), or Ironforge. And wait from here. And then go from point I(ronforge) to S(cholomance).
The world was huge during levelling (When i got my first flying path, i yelled on my room and ask my dad to see it, i was so excited), but way less during the high-level content.
And if you wanted to do raid, you had to farm component. Something you usually do... alone. Most of the time. The ones from Strat (I don't have the english name, for the enchant) might be an exception. All the time you can either do that for yourself, or contribute alone. But it's still a solo chore to do before the raid.
(And classes like warlock had to farm the shards, damn it, even worse)
WoW has been a destroyer of all the other mmo because of his casual way of MMORPG.
And please, do not link me Kungen videos. This guy is the parangon of all i hated in the community in Classic. Narcissic, arrogant, despicable, the pvp mage of his time. He said on one of his stream that PvP players are not real players (You cannot imagine how many time i heard that : "real players"), shouldn't be listen to. And find perfectly normal that most of the class got rejected for PvE.
That's rich coming from a guy who played the only viable tank class. Exactly like this irritating guy advocating for classic, asking people to harass streamers and stuff. "Alexensual". He is passionnate, you can't deny it, but come on. And what is he playing? Priest. Heal.
I could say "I don't understand why you dislike PvP as balance druid, i got just fine as undead shadowpriest"
It's like all the rdruid in S5 saying that "Woah, it was real PvP in TBC when i played SL/SL rdruid in 2v2"