I say 'Yes' - let's join the 21st century. An added feature that's available at the discretion of the user is always a potential benefit. I would use it.
The wonderful dialogue on this board is certainly why we all enjoy participating but anonymity can facilitate honesty
I think members genuinely would like honest feedback about not only their own choices in fabrics, borders, threads, batting.. but also feedback on, say, the next sewing machine they want to purchase, irons, etc.. and I can see a benefit to having a poll to provide that feedback. It's not unusual for a thread to have 1,000's of views which offers the opportunity for measurable feedback through a poll.
I find this board a wonderful place for camaraderie but also a platform where we help others seeking advice/guidance and a poll feature could prove helpful in that aspect - certainly don't see how it would hurt?
Just my two cents -
Christine