I see bull's strength and endurance get cast every day by the party clerics (almost always all of them).
Also on the divine list (outside of cures, naturally) is sound burst, and lately, since things have been on or near water a lot, water walk and water breathing.
For arcane spells, I see lots of mage armor, shield, magic missile, polymorph (other and self), alter self, fly, the buffers (b's str, etc), and of course artillery like fireball and lightning bolt.
But absolutely at the top of the list are bull's strength and haste. Everyone wants 'em, both of 'em.