I call the pacifier "daddy's nipple." Don't tell DH I call it that, though.
Basically- I never wanted to use it and I pretty much forbade them. I didn't have any in the house and DH really wanted one for some reason. He complained about it to his mom, who bought her some. So now every time
I give Evelynn to DH for him to take care of her, she ends up with the pacifier in her mouth. I hated it at first (I felt kind of replaced in a way IYKWIM), but I've gotten used to it.
I give it to her now only right after she nurses if I put her down to sleep because she's really noisy otherwise (not crying- just grunting and sighing a lot). I'd give it to her when she's in her car seat if she need it it but she LOVES her car seat (I even use it just as a place to put her while I'm cooking, etc.) so that's not a problem.
I don't really see a problem with it. It's better than sucking on a hand. It's just that for me, personally, I just don't like being replaced by a plastic nipple.
BTW- I really wish I could co-sleep. I've been trying since she was born but I just can't get used to it.
OK now I'm just rambling...