BG experience is slower then quest experience. Instances with a tank would probably be faster, but a lot of us have done 5x Shaman with Earth Elementals for pve; leveling you won't likely be doing heroics, so this can work.
A note on the BG experience... You are simultaneously leveling your team and accruing honor, which means you'll likely have 3-4 pieces of honor purchased level 80 gear, when you reach 80th. This is a pretty big and immediate equipment upgrade.
The easiest way to level 5x the same class, or any 5x mixed composition, is to group them together and level as a team. It will be slower then 4x and a booster, but they will level together. You can also go 4x and a booster, and then use granted levels to create a level 60 on the boosting account. The RAF sticky thread shows this. Pretty sure I linked it in the first post.
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