Yeah, force size being equal the older editions are slower to play... but for some folks, like me, that is a decent trade-off for the extras they bring.
I like rules with atmosphere/character/story and it takes a while to collect the miniatures/paint them/make terrain/set up a table... so I don't much mind savoring the game for a while longer after all that work.
If I want a faster game I'll play a small skirmish game like Song Of Blades And Heroes.