I haven't played much WoW since Cataclysm, so I'm not sure if anything has changed. I rolled a Resto Druid a couple of weeks ago, and in every dungeon I'm queued for I have found myself pulling all aggro off of the tanks. At first I thought that maybe it was just a couple of bad tanks, but it has been every single one that I have encountered.
It has gotten to the point where I nearly have to let the group wipe before I start healing in order to keep the aggro on the tank.
Is this typical? Do healing spells now generate significantly more aggro? Or has every one of the last 60 dungeons I've encountered just had a tank that wasn't as effective as I remember?