I don't think I am, but DH think I really am and so do a couple friends.
baby doesn't scream unless she's not being fed so won't have any issues there. I would sneak in way before start of movie so no one saw her and wanted to kick off about it and would leave promptly if she did make a peep.
Our local cinema do a baby morning once a week but would like to go out with DH only we haven't anyone who can baby sit for us.