I used GSX to warp me to the gate. It didn't light up. Do I need to follow the car instead?
The "Warp me to the gate" option does exactly the opposite of what you need: it "teleports" you instantly to the gate, WITHOUT enabling it for GSX usage, which means preparing the gate with service crew/vehicles AND activate a Docking System, if the parking has one.
What you need to do, instead, is to SELECT a parking with GSX. Using or not a Follow Me car doesn't make any difference so, both options will work the same, just not the "Warp me to the gate" one.