I logged out to see what the changes felt like. You obviously can't see the icon that tells you there's a poll, but on a thread with the poll you can see that votes have been cast, so the responses are not too confusing. Is it worth mentioning the polls in the bit where it prompts you to login to reply? The bit that reads something like 'If you are not a member consider signing up. Members can chat in the forum etc'. Is it worth adding 'vote in forum polls' or does that create more clutter?
You've probably considered and discounted this already!