Basicly being able to boost while queuing up for randoms is working ideal for me. I'm getting another person to que up with my 4 man RAF team, once we are in the dungeon I kick him from group and invite my 85 pally on a 5th account. This essentially let's the team receive the "random dungeon" xp reward....... And with the pally boosting the run is fast.
When I hit 15, I qued and got deadmines. Less than 10 min later with the dm quests and random dungeon xp reward done, I was 19.5.