The BW zone line is the only flat area where you can reliably AE without forcing something under the world. It also has no roamers and gives the puller plenty of room to circle and do his thing.
I've never once been in an AE group that refused to rez and/or buff bystanders. I suspect with C2/haste and other buffs from the group you'd actually level more efficiently than if you had not crossed paths with them.
-Xasten
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