I don't really get a ghost penis (and it pains me to say penis in the possessive).
But as someone pointed out, it's tissue that has been remapped. So, sometimes I will have sensations and have memories of when that area was configured differently. But, I wouldn't call it a "phantom limb", it's more like a particular area. Like, sometimes when my clitoris becomes stimulated, I can remember when that was the tip of my penis, even though when I touch down there, it's not at all like that. Or sometimes I will have an itch and I recall where that used to be mapped, however I can't scratch it the same way as I used to : )
I have heard of women who have no recollection of what their previous genitalia was like, and I have a hard time understanding that. I'm not saying they are lying, it just hasn't been my experience. I still have memories of the prior configuration, although it has diminished and I wouldn't call them vivid experiences. Maybe I should thank my surgeon for retaining such good sensation down there!
So yeah Valerie, I kind of get what you are saying. And to the others that have had the dreams...yep, had those too. Scary, aren't they?! Luckily they are just bad dreams, nothing more.