First, there was scripting in EQ.Wow is more difficult from an individual player perspective than anything in MMO's before it. The introduction of scripting increased APM requirements by a massive amount.
Second, the reason I disagree with this sentiment is because MMOs generally don't stress players from a gameplay perspective until they reach the high end of the game. The difficulty in leveling is to figure out the best way or any way to make progress. I remember being a n00b in EQ looking for better places to level and it wasn't trivial when you had gryphons and guards and lockjaw popping out of no where to give you another chance to spend a half hour looking for your damn corpse.