Amazing thread indeed, I registered just for this one. The following pop up while reading druids facts :
In vanilla, back before patch 1.X, the druid action bar didn't change when you were changing form (should have been the same for warrior and their stances I guess). You HAD to use a macro to shapeshift and bring the right action bar at the same time in one move.
Sometimes it didn't work well and you just go like : - Yeah bear, armor, hp, rawr ! No no no, no insect swarm, where's the bear bash button d****t ! ><
Also in vanilla, shaman's rockbite used to add additional threat to weapon for shamytanks, and they had a specific talent to boost shieldblock by +5% for tanking aswell.