If I'm leveling a dps, I'm not just leveling a dps. I'm always doing other things in the game while waiting for the queue, like working on one of the crafting jobs, doing glam stuff, doing market stuff, etc. If the queues were the only thing in the game I had to focus I would have probably given up months ago and I just started early last year. It's one of the reasons I'm so glad we can do everything on one character.