Commander's Badge is basically on its own cooldown(only shares it with the lesser versions). The rest of the minion trinkets are on a shared cooldown. Having a few friends in BGs activating
[Tiny Voodoo Mask] and
[Commander's Badge] at the same time kind of borderlines on broken because there's so many targets that even the AEs that would have 1 shotted them don't because of the damage split. and they all do respectable damage. As a moonkin I even get 3 extra trees to join the party too.
While using this trick for bosses is decent for some free damage, the overall damage is pretty small that the 30 second wait for the trinket to become available kind of lessens the worth. However, it is VERY useful for any random target spells, as each individual pet can soak a spell. This is incredibly effective on bosses like Aran and Dorothy who only use random target spells. They always kill all of my trinket pets before they despawn(I used the Barov Peasants since ZA wasn't around back when I was doing Kara). I never used the Commander's Badge since it used to require you to be outdoors to use it, but I believe they changed it to be usable anywhere, so that's 1 extra soak target.