Wow 2 min wait. From experience 30sec is plenty of time for a group of people to work out a strat for one setup/map. I play World of Tanks a 15 on 15 pvp game from time to time and it has a 30sec prep/load phase. If your running with friends you are already well aware of what you need to do and just need a few seconds to concur. If your playing with a bunch of random people even 20 min wouldn't be enough to get them to work as a cohesive group, so why wait 2 min.

After the first few days of matches people with get the hang of what to do and not need so much prep time. There's no need for a long timer for a boss fight or dungeon run. If you don't know the dungeon explaining it for 30sec or 2min wont make a difference and if you know it already 2 min is painfully long.