I tend to try to get around 2-3 pulls to get to the boss assuming I have good aoe. However, if I see the healer is just standing there not doing anything when I'm not taking damage then I'm going to put them to work and start pulling more if they don't want to help clear trash. The way I see it if a healer wants to just heal then that's what they're going to do with heavy pulls. As for dpsing pulling ahead of me (which I haven't seen happen yet) I'll pick it up from them. It's not like an extra 2-3 mobs will change anything. Now if we're lacking in the aoe then I'll just tell them to watch out and if we have massive aoe then that's good.