I sometimes still notice if people use the wrong pronouns, but it doesn't really bother me because.. well, I know who I am. If my friends do it (which isn't really often anymore) they correct themselves before I notice. My family of course, still have trouble with it, but again, usually correct themselves.
Just to concur with what others have said so far, I think you're comfortable with your identity, therefore these things do not come to your attention like they would for someone who is still quite unsure/anxious. I can relate to the point Jason made, because I think I've really just desensitized myself because I don't think there's any point in getting upset. For a while longer, I'm sure people will always make mistakes, especially those I don't know.