Speaking for myself, I loved TBC because it’s when I started WoW. And I started early in the expansion (I played on Defias Brotherhood) so I did get to experience something akin to the late Vanilla leveling experience (with the slower leveling and areas such as Jin’tha Alor being elite).
And being a Druid player, Flight Form felt awesome! When I first got it, I remember just flying around Outland for an hour with “Learning to Fly” playing on repeat! And I remember a PvP spat I and 2-3 other Druids had with some Alliance gankers in HFP. We defeated them and just flew around over their corpses like vultures, bear-bombing them the moment they tried to rez! It was glorious 