Anymore in Battlegrounds I just travel from place to place using Ghost Wolf. I rarely mount anymore. I still check the opposing team's roster, and if they don't have any rogues I'll go back to using my mount, but I'm never that lucky.

In WSG, I'll start crossing the the map using my mount, but I dismount and go ghost wolf after about midfield. I hammer my /follow button on that map. It's particularly prone to having an abundance of rogues.
Same thing for most maps at the start; use mount at the beginning when you know rogues aren't around.