this happened to me a bunch when i got my shaman to lvl 70, and its happening again as I lvl my warlocks.

I have 3 warlocks at 50 and 4 shamans at 70 now though.. so when i get ganked, i try and find some water, die if necessary again to gain the water advantage, ninja summon in 3 shamans, and proceed to walk out of the water with my last online warlock, as bait to lure the offending horde out of hiding. The warlock takes it for the team and usually gets ganked but theres a suprise incoming, 3 elemental PvP specced s3 shamans blasting him and camping him and all his friends he brings for hours of fun filled entertainment. yes, it cuts hours off my lvling, but while im offline im getting a tiny bit of rest exp and free HKs on my shamans =) its a win win situation, and the horde will usually get the idea, and in the long run will not bother you without a HUGE group, and thats fine by me, I can take 10 horde on my shamans if they don't know I'm coming =)