Plus, segregating List-type of threads does help encourage posters to create threads that will promote more discussion if they want them to remain in the main general movie discussion board.
I agree, not all poll threads would have short responses and could generate discussion. But there is also the possibility of creating more threads just looking for reflex responses, of which we already have many.
And majoraphasia, obviously we're not packing it in quite yet, so it makes sense to do everything we can to promote more discussion (the great movies section being a prime example).
For right now, if someone wants there to be a poll in a thread they created, PM a moderator and we can add one for you if we see fit.