3-4 dpers had CC and only 2 was reliable. Great hunters were god-mode (but great hunters were non-existant back then) cc-kiter-machines. And LOL at the lock fears pulling half an instance even after performing back-pulls all the way to Shattrath!
I remember warlocks would pull with Fear and then switch between Curse of Recklessness and any other so that they could cancel the effect if the add was going too far away. And of course, the Succubus's Seduce.
Also, some groups that claimed they didn't use any CC were playing at the late cycle of the expansion using a Protection Paladin as tank, as they could hold aggro rather well in 5-man heroics compared to other tanks.
In all, things have changed in many, many aspects, it's not just the difficulty of the dungeons by itself that has changed (mechanically I'd argue that all of them were easier than the newer ones), but also how we, as players, play our classes.