I bound a key to strafe left and right for my alts at level 80, except I don't use it, ever.

For one, theres almost always a tactic you can use that is far easier than trying to strafe your alts left and right (such as using the corridor in the SS above and not having to strafe at all).

For two, its just a PITA. Strafing my alts takes more effort than just setting /follow and moving my entire team.