Just the other day i found myself thinking that the Nerubians are the first time a foe really feels truly numerous since at least the Legion.
They feature in every zone, act everywhere throughout the expansion and they exist in countless varieties.
Perhaps this is aided by their more monstrous appearances, as though i loved Legion i found its demons extremely lacklustre and far too humanoid in various senses.
And then when you finally enter Azj'kahet: Flyers everywhere, halmarks of their presence intensify and more.
The various subfactions yet further reinforce this.
Honestly only Ahn'qiraj gave me vibes of this scale, even Ulduar felt smaller somehow, and the Scourge despite all its awesomeness never felt this coherent.
Agreed?