It really wasn't stuff took longer. The only hard part was not pulling extra mobs but they're were just target dummies and bullet sponges outside of that. In mist we got mobs that would one shot if spells weren't interrupted but Vanilla rare mobs were just gear checks. Someone in the best raid gear available could get 2 shot by rares back in mist.
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Dungeons reward raid level gear and scale with item level. There was no reason to go back to dungeons in Vanilla once you had decent raid gear outside of a legendary quest or attunement.
I miss server communities and getting upgrades while leveling. I'd also wish they'd increase the difficult of leveling but decrease the time it takes. Adding scaling difficulty to dungeons would be awesome like Destiny 2 same thing with older raids. You could pvp, raid, quest, or do dungeons to level.
Leveling mobs could two shot people with specials and channeled attacks so interrupting was more important. Debuffs could be more dangerous and make leveling slower so avoiding them was more important. Sense warriors can't avoid physical debuff they only have negatives that effect caster but sense warriors have kicks and interrupt out the ass all ranged debuffs fuck warriors/melee damage instead.