If your not using cooldowns on pld your doing it wrong. Even most dungeon content doing small pulls you hit rampart or convalescence cuz that's how pld play style is. Sure you might think you don't need to but if your in a dungeon and you have a healer that's struggling with mp why not just do him a favor. Dps pull a mob off you and provoke is down (this doesn't happen much but it does) use cover and keep the dps alive, stoneskin is probably the best cross class skill you can have for damage mitigation on yourself or the other tank.