Yes, I'm with Kedri on this one.
And yeah, we can do surveys manually -- but it's more awkward, less efficient, and probably garners fewer responses. The easier something is, the more people will do it, and it's a lot easier for someone to reply by ticking a box and clicking a button than making a whole post where they have to scroll up and down matching up questions and answers. Then those have to be compiled for results, etc...
Hey, I'd vote in a poll for implementing a poll feature, if I could!
EDIT: Umm, did anyone else notice that we can already make polls, but only in the project forums?