Well, thankfully there is the fact that as a tank, I very much strive to be as good as I can. And keeping aggro now is so easy in the lvl 70 content that after getting the mob's attention for sure(and keeping it) I move onto the next priority: keeping the mitigation up.

As a healer I have noticed another tank priority that some people just miss: healers need mana to heal. Particularly off-spec healers when healing low-to-the-instance-tanks that have no idea whatsoever what they're doing. One SFK run our tank was so busy getting through that our main healer(holy priest) was out of mana, then it was soon me healing and subsequently out of mana. We'd just survive through the few chain-pulls... then the tank would pull more. *sigh*

Tanking now is easy, it is no reason to get sloppy. I actually kinda like how it's somewhat easy to keep aggro - it will, in time, make it easier to see who really are the tanks who do their "homework", and who strive to do the extra 10% dps when everything else is said and done.

Then again, I don't PuG with my main the tank. It's just too expensive to wipe in a pug because some hunter/warlock/mage/rogue etc. has never heard of aggro management. Also, it's frustrating to wipe on stupid things like that.