we use analytics, have used adwords and even adsense sometimes - i doubt there's anything google doesn't know about our site ;)
we do have interesting content though and have benefitted greatly from facebook likes. if google can get people using the +1 then i believe we only stand to gain.
however i'm not sure how many people in our target area (uk mainly) actually have google accounts and will be logged in to use the +1. if you are not logged in, then the +1 doesn't even appear
as you point out, at the moment on our pages we have a big fat zero next to the google +1 next to lots of facebook likes. hmmmm. if we see no movement over the next month or so we can always take it off.
I believe that one of the elements of Panda was that Google was giving better rankings to sites that were clearly not SEOed.
whether it's called seo or not, allowing people to share and recommend your content is simply good, common sense.