See, I'm all about the in-character role-playing, funny voices and all. I have trouble imagination how a map and minis could provide a significant distraction from me from enjoying my friends role-playing their (oddball) characters (or my own). YMMV, and obviously does.
I never used minis in an RPG. Minis take me instantly into "strategy game" mode. The bird's eye view, the counting of squares, the way people start moving according to mechanics, going by maps instead description, all that hurts my immersion. I don't see characters, I see pieces on a game board, and it takes an effort to look past that.
I'd rather spend that effort on other things that enhance my game.