Originally Posted by
Owltoid
The totem cooldowns or the other toons is shown through TellMeWhen. Basically the addon just keeps track of when it saw the toon cast the totem and counts down from there depending on how long it thinks the cooldown is. I don't believe the cooldown is adjusted for abilities that would reduce the cooldown (eg talented totemic recall) but it works pretty well.
For the most part they're just there for show. Usually too much is going on for me to look down there. The things I focus on is the count of maelstrom proc and elemental blast cooldown. As soon as I see red lighting across the toons and EB is ready, I try to burst down a lower health target.