One thing that may initially be confusing as you look at Pandaria tooltips is the very high ‘base mana cost’ of spells, especially if you compare them to a mage or a warlock. This is not a cause of concern.
A mage or warlock has a 100k base mana pool. (Mana pool is no longer influenced by your intellect). Druids have a 20k base mana pool (due to Feral and Guardian druids). Restoration and Balance druids learn ‘Celestial Insight’ at level 10, which increases our mana pool by 400%. (Thus giving us a 100k mana pool).
The base mana costs are of the base 20k pool, so while it may seem alarming to see Hurricane cost 75% of our base mana, in reality, that’s only 15k mana. A mage’s blizzard costs only 5% base mana, 5k.
Is Hurricane still 3x the cost of a similar spell, Blizzard? Sure, however we also now gain 35% of our entire mana pool back every time we hit an Eclipse. Last I checked, mages do not have that sort of constant mana return.