Great post/good memory
"----------And not only that, all non-boss mobs in every dungeon were on a 2-hour respawn timer. "
That was the later nerfed version, iirc
Early on, at least stratholme and scholomance respawned patrols really fast (5-15 min?) and the rest of the mobs a bit slower 30ish min (couldve been more, not sure, but not 2h)?
I recall looking backwards and seeing patrols spawning, poking ppl to move on etc.
I recall sometimes wiping and it was basically a reset due to full spawns, or wiping and rushing back in as mobs were spawning, invis potting the group or rushing in and ressing me (tank) further in.
There was a long questline back and forth trough scolomance The_Ghosts_of_Caer_Darrow_quest_chain (not allowed to post links) , that in the end rewarded a couple of "endgame-blue" weapons, due to the difficulty of strat/scholo almost no one finished it.
Soon people started exploiting raids in 5man instances (you were able to take 10 players to 5man instances), disbanding to pick a questitem or do some queststep, rejoining raid. I played on US-warsong at the vanilla release and i think my group were the only ones there to finish that questline there without the raid exploit in the first couple of months.