Still, how long could a conversation after the movie about the movie even last? "Yeah I liked it, it was funny when that side character said X, and it was cool when plot twist Y happened." 5 minutes later you're back where you were unless you're both film buffs and do a whole critique of it.
I prefer date activities where you can talk about them as you do them. Even bowling sounds more fun than a movie date, to me. But maybe that's just me.