Spellcasting. Druids (for some crazy reason) are full casters, so they can overcome a lot of obstacles that non-casters need to use magic items to overcome. As such they aren't limited as much by the VoP restrictions.
Unless, of course, you are playing with VoP RAW and your druid plans on casting spells that require a DF...which many do: The Summon Nature's Ally spells, Reincarnate, Goodberry, Control Plants, Delay Poison, Animal Shapes, Air Walk, Flaming Sphere, Freedom of Movement, etc.