I've only played DPS ever in mmos but a few weeks ago I switched to healer. I was nervous because there is more responsibility on you where as DPS you just deal damage and avoid damage. The only incentive I needed was the instant cues I have now. Not once have I waited more then a minute for any cue on any dungeon.

That's all the incentive tanks or healers need. If you want to instantly cue on anything you need to play it will happen nearly every time. So basically you can run 3-4 dungeons before a DPS can even que for one or two. I love DPS but I'm willing to switch from it for the ability to play whatever I want whenever I want.