Like Abacus said, there is the +10 skill boost on archery. I'd rather have the special effect be something directly related to archery though rather than animal control Animal control did come in useful at low levels against trolls, but I haven't used it at all in the upper levels. Off topic - maybe a chameleon effect (not invisibility) while outdoors in a forest.

Back on topic - use a low powered bow. Also, since my Bosmer's sneak is so high, enemies will run past her to get to her follower. As a result, she can keep her bow out longer, getting more hits and leveling a bit faster.