I use focus for my main. I use /cast [target=focus-target] DPSSpell for my DPS. No assist, nothing, just that spell. I use /cast [target=focus-target-target] HealingSpell for my heals. No heal each char, just that heal. It helps incase your alts pull aggro. The heal works the same for the tank or alts. I just don't like targeting people or mobs, I just let the macros do it for me. It makes it easier since I can use same macro for any char.