Yes, yes. I lose some objectivity with mixes. I'd be lying if I denied it.
That said, I do feel like I have an insight with this band that another producer or engineer would have to learn as I have. I mean, everyone has their strengths and weaknesses, their own confidences and neuroses, and I defy any well-meaning producer to identify them in each member of any band very quickly. There's the feedback issue, as well: I know the difference (in my band, anyway) between a personal performance insecurity and a big red flag.