I'm reading this forum quite a lot and decided to contribute again although my first contribution (how to get world first Litch king kill) people though that i was asking a question or something >.>
Anyway I'm always bored before WG starts and usually get in raid and just fly to Icecrown and slowfall to WG fortress...
always get on the front wall near the cannons, It's possible to get on the wall from the right tower located right from the Front gate.
I'm always there before the battle starts and i've noticed that when it actually starts after 10 sec i get 20x tenacity buffs and can quickly kill hordes with 20k frostbolt crits or 4-shot the front cannons and if i'm quick the 2 middle fortress cannons too. So:
1. Get into wg raid.
2. get in wg fortress before the battle starts.
3. Wait 10 sec after the wg battle has started.
4. Get 20x tenacity buffs for 40 secs(before the rest of the alliance have loaded for you in the zone)
5. Have fun/ piss off horde
edit: forum made my carefully planned/written post and made a big wall out of it =[