if trash is dying really fast i wouldn't worry about much other than just spamming wrath, but its very mana-hog'ish

i use this for my 3 castsequence macros on my boomkin for pve

/castsequence reset=target/combat/14 Starfire, Insect Swarm, Moonfire, Wrath, Wrath, Wrath, Starfire, Starfire
/castsequence reset=target/combat/14 Moonfire, Insect Swarm, Moonfire, Moonfire, Moonfire, Moonfire, Moonfire, Moonfire, Moonfire, Moonfire
/castsequence reset=target/combat/14 Wrath, Insect Swarm, Moonfire, Starfire, Starfire, Starfire, Wrath, Wrath

the top and bottom ones u switch back and forth based on proc's. Crits with Starfire increase damage done on target by wrath, and vise-versa. so when u crit, use the other macro.
talent improving Insect swarm, makes all damage taken by spells increase (arcane nature, etc etc) so its good to put inthe rotation for your other chars to get more dps too.
Moonfire i have in there just for more dots, but its also not very mana efficient so remove it if mobs are dying fast and just stick with starfire/insect swarm as much as possible. with some haste your starfires should be close to 2.5 sec and very mana efficient.

put the Moonfire macro on your shock hotkey so when u use flame shock/frost shock etc you'll also nuke with instant abilities from the druid, i also use it on same key as my Fire Blast on my mages.