You have this backwards; the queues aren’t long because they turtle, they turtle because the queues are long.
When they wait in a 35min queue for AV, you bet your butt they want every drop of honor they can get out of the match. That means back-capping. That means burning every tower. That means farming HKs. The long queues incentivize the Horde to “get their money’s worth” in each match. The Alliance prefer 6min AFK-AVs because they have instant queues.