I have tried incorporating Ghostly Strike into my rotation so many times and I always end up being disappointed with it.
This time I tried it with 5.2k haste + Bloodthirsty Instinct and it felt miserable in any AoE situation. I know Quick Draw is considered better for AoE, but I have seen plenty of people from logs using Ghostly Strike with even less (and at times ridiculously low haste) and I have no idea how they do it.
It feels particularly bad in Mythic+ where you often have to quickly switch targets to use CC, even chain CC like Gouge one and BtE stun another. It feels clunky as hell then finding your original target, which probably has little of the buff duration left or none at all, then you have to find a new target to apply it to. Also, on any difficulty below 5 it is not very viable on a lot of trash packs because they die so quickly with a decent group of DPS.
I am probably over exaggerating but this is how I feel. The rotation with Ghostly Strike just never worked out for me no matter how hard I tried, it never felt natural compared to Quick Draw and how it smoothens the rotation, especially with the need to re-roll often times.
Also - it totally makes sense with how Blade Flurry works our character being the source of the cleave.