Really depends for me... I've had some really bad tanks, healers and dps that just couldn't stay alive no matter how much I tried. After the third rez you kinda give up on them. This led to a Iffy hm run that lasted 15 minutes or so with the only people still alive being the MT, myself on WHM and other WHM that I had to rez once. With myself and the MT the only two that never died - rezed all the other DPS multiple times.
Someone once mentioned that the WHM idle stance is to cutesy... just look at that smile... it's the smile of someone that knows they have your life in their hands are just contemplating what to do with it mwahahahahahaha.
But yeah might avoid healing DPS that pull ahead of tanks - and my friends do the same - be them on tank or heal. One DPS was amazed when one of my tank friends told him there's this interesting strategy he's following... called tank pulls. I couldn't stop laughing at that.