I use it all the time, but you gotta be smart about it.
1) see if anyone is in zone, if empty, I warp at will
2) if someone is in zone, 90% of the time I don't warp.
3) if I do warp with someone in zone, I make sure it isn't near them (check map, /target player name in zone). I also make sure it isn't to like an island past them for example, or, any camp where I would have to physically pass them.