I wouldn’t say “deference” accurately describes my intent when using the terms, but my usage is probably a bit atypical.
I use them in much the same manner as a judge would use them when addressing a litigant, or a teacher might use them when addressing a student: to indicate a respectful and welcoming mentality, but without inviting familiarity. When I am happy you are here right now, but I don’t particularly want to be your friend.