Holy: Divine Favor - Your next Holy Light or Flash of Light is increased by 100%, costs no mana and is unable to be interrupted. Protection: Steed of Glory - Your Divine Steed lasts for an additional 2 sec. While active you become immune to movement impairing effects, and you knock back enemies that you move through. Retribution: Unbound Freedom - Blessing of Freedom also increases movement speed by 30%. Priest
Travel Time is what you will be doing the most of, thus talents or abilities that increase movement speed will likely have the highest impact on leveling speed.The more important concept is this: Shaving off seconds of downtime between pulls is equally valuable to shaving off seconds of In Combat Time. When you think about it this way, Damage Mitigation and Regenerative talents / abilities / stats have almost offensive properties and should potentially be valued equally to stats that increase damage.