lol, if I've been solid raiding and nothing else for like 5 days even I sometimes forget and over nuke

but then it's not generally a problem cos I know the tanks I play with very very well and know they can hold agro or at least rescue the mob back before it turns this squishy into a pile of ....well.... squish
However most of the time by the time you have pre-buffed, pre-cast, debuffed etc any tank worth a shit should have agro in the bag anyway.
We have some exceptional tanks on Kith, same goes for wizzies, unfortuantely we also have a large number of each who either have total amnesia when it comes to understanding their class or else bought their toon on Bazaar ;)