The Daily Grind: What's your favorite long-cooldown skill?

In Guild Wars 2, one of my favorite skills to use is the ability to unleash a cranky mechanical golem upon my foes. It only lasts for 40 seconds and has (I think) an 180-second cooldown, which means I don't get to use it as often as I'd like. However, it always makes me absurdly happy to pull it out, and I wonder if the long cooldown is one of the reasons I appreciate it so much.

It's pretty common for developers to balance powerful skills with a lengthy cooldown, leaving the choice up to the player as to when and where it's best to unleash hell. It's not uncommon to be in a dungeon run and have the leader instruct players to pop their cooldowns on difficult fights; sometimes that long-cooldown skill is what makes the difference between victory and defeat.

So what's your favorite long-cooldown skill? When do you tend to use it?

Every morning, the Massively bloggers probe the minds of their readers with deep, thought-provoking questions about that most serious of topics: massively online gaming. We crave your opinions, so grab your caffeinated beverage of choice and chime in on today's Daily Grind!