I also like to do things like:

#show LongCooldownSpell
/castsequence reset=9 LongCooldownSpell, SpellTwo, SpellThree, Null

I do that with the buff spells for each of the teams, especially the self buffs.
The Pally might only be casting a weapon buff, and I'd rather not spam cast it six times.
The Shaman might have a weapon enchant, Lightning/Water Shield, etc.
Spam the hotkey, until the last toon stops doing things, then they're all buffed.