When I ghost, it's only through a left turn, and I am actually riding next to the right fender, riding next to the car, inside the turn, not following it. I don't do it often, usually only when it's an unprotected left turn, or a stale protected left (in jeopardy of going yellow or red with me in the intersection).

And of course, like many things, it requires utmost attention to your situation, including the possibility of an undesirable response by a startled motorist who gets an eye full of bicycle in their driver's side mirror.

If you don't think it's safe, don't do it. No problem. I'm just saying the way I do it, I can't be hit by cross traffic, either. I don't follow the vehicle. I ghost it. It ranks up there with riding on the sidewalk. I'll do it on occasion, if the situation absolutely warrants it. It's certainly not the norm for me to do it, but it's an arrow in my vast quiver of riding tricks.