After clearing both The Serpentshrine Cavern and The Eye in Tempest Keep, here is my little collection of useful macro for some bosses.
Leotheras the Blind
As a healer, the inner demon isn't really easy to kill. With the 30% damage on all healing items, it does help a bit. However, it is useful to let your healing squad knows that you are taken out of the fight and you plus your target needs some help. Channel 6 is my raiding healing channel and I usually heal the warlock tank. On one click, I send the message to the channel, get Barkskin up and equip my pew-pew weapon in order to nuke the demon faster. Barkskin is useful since the demon does mostly melee damage and no spell interruption means the demon dies faster.
#showtooltip
/6 ='.'= Aethel has inner demon. ='.'= Assist on warlock.
/cast barkskin
/equip Merciless Gladiator's War Staff
/equip Idol of the Avenger
/cancelform
/stopcasting
Lady Vashj
To fight her highness, the macros are mostly about the tainted cores. When I was moonkin and need to take care of tainted cores, I use the first macro to help me to save time in targeting and get full out asap, plus a fast whisper to the runner for grabbing a core or assist killing the water elementals at my location. The second one is a standard one for the core throwing, with a little touch of roleplaying.
#showtooltip
/tar tainted
/cast Moonfire
/w _____ Tainted one at NE.
#showtooltip
/use Tainted Core
/s %t, catch the tainted core!
/script SendChatMessage("!!! YOU HAVE THE CORE !!!", "WHISPER", "Common", UnitName("target"))
High Astromancer Solarian
Another standard macro for healers, but this time is mostly for paladins. I found that druids' HoT are great to top up the fall damage of the bomb carriers. Catch them before they go out of range and throw a lifebloom and a rejuvenation, then they will be in full health when they get back.
/tar High Astromancer Solarian
/assist
/cast Flash of Light
Kael'thas Sunstrider
The legendary weapon are very attractive, yet camouflage. Cosmic infuser, the healing mace, is tiny and very difficult to spot. Tanks use target macro to grab their weapon fast to tank it. Healer can use the macro to find and loot it. And even better, EQUIP it. It saves you time opening your inventory and locating it. Sometimes, I also pick up a staff and use the aura, so it is embedded in the macro too. Ideally, one could bind a spell in a macro with /use 16, which 16 is the main hand slot.
/tar cosmic
/equip [button:2] Cosmic Infuser
/equip Staff of Disintegration
/use Staff of Disintegration
I made a lot of elixirs and potions, but the daily transmute keep ninja-ing the discovery chance, or it seems the transmute discovery has higher chance than flask ones. Not a very useful transmute discovery, but let's hope for better next time.