Yes, if it has a poll I am far more inclined to open the thread. Why you ask? Because I am someone who is normally uneasy even typing something, and a poll helps me feel like I added something to the thread without having the commitment of a post.
However even though I will see the poll marker first, I will still see the thread title before opening it. If the thread is something I really don't feel like looking into for any reason I may skip it anyways (Though the poll still makes me have to rethink some threads).