As the title states here is a couple addons that I have been using lately to farm Rare mobs and track down treasures...
Rare Finder...puts skulls on your map where rares are and puts an x over it after you kill it
Draenor Treasures...puts the location of the random treasures on your map and uses the TomTom waypoint arrow for a little added help (so if you don't have TomTom now...add that to the list)
For the returning players or players trying out a new class and wondering what their rotation should look like...this addon helps, but is not the be all end all...
Ovale Spell Priority
Just a couple, but if anyone has questions...we are here to help...yup even me