They removed /Follow from Battlegrounds, which includes Rated Battlegrounds.
It still works in Arena and World PvP, if you're into either of those.

Similarly, Rift removed follow from their Warfronts.




Multiple person mounts are an option, in Warcraft.
Assuming your team is small enough that everyone can get on the same mount.




You can use Interact With Target.

A Druid on your team, in Travel Form and with a minor glyph (so their Travel Form is a player mountable Stag) is a valid IWT target.
So if you lead with a Druid, your team can follow you while in Travel Form... which is something.

You can also IWT your melee toons, against an opposing player or NPC.

Unfortunately, you cannot Travel Form indoors.
And cannot use mounts (multiple person, being the key) while indoors either.