If the option was there, ofcourse people would use it anyway.
C1"Hey, lets go to another map"
C2"Ok"
C1*Poofs*
C2*starts running into another portal*
Not so likely to happen exactly.
I think the main reason why people are feeling a need of having a fast travel function, is simply because the starting map and teleports are placed different.
In IT there was this rather small starting default map with several teleports in one place. Even though you couldn't get to every single map right away. Teleports were close, and you could get back to default that way aswell. Maps were actually smaller in most cases.
In FH, there's just one way to the rest of the maps, and you can't go back to bonfire unless you reset your home and teleport there.
I'd personally would want some changes to the start map and teleports instead of a fast travel function.
IT worked perfectly fine without one. FH could aswell.