Movement Speed
Party movement speed makes dodging waves, running from beams and reaching safe zones easier. It is especially valuable in mechanics that slow or disorient the group.
Specs that bring movement speed

Guardian Druid
Stampeding Roar
Brewmaster Monk
Tiger's Lust
Protection Paladin
Blessing of Freedom
Restoration Druid
Stampeding Roar
Preservation Evoker
Blessing of the Bronze
Mistweaver Monk
Tiger's Lust
Holy Paladin
Blessing of Freedom
Discipline Priest
Angelic Feather
Holy Priest
Angelic Feather
Restoration Shaman
Wind Rush Totem
Feral Druid
Stampeding Roar
Windwalker Monk
Tiger's Lust
Retribution Paladin
Blessing of Freedom
Enhancement Shaman
Wind Rush Totem
Balance Druid
Stampeding Roar
Augmentation Evoker
Bestow Weyrnstone
Devastation Evoker
Blessing of the Bronze
Shadow Priest
Body and Soul
Elemental Shaman
Wind Rush Totem
Affliction Warlock
Demonic Gateway
Demonology Warlock
Demonic Gateway
Destruction Warlock
Demonic Gateway