netmeg - 2:10 pm on May 9, 2012 (gmt 0)
There's a company I use for usertesting (hint - google usertesting) where it costs as little as $30 to get a short screen-video of someone trying to accomplish a task on your site. I've run these for clients who were shocked at some of the results. One said to me "I kept wanting to push his mouse over to the right spot!"
That's how you know you still have work to do.
I believe it's flat out impossible to be completely objective and impartial about our websites, no matter how much we want to be. They're like our children. You NEED user perspective.
(But this is veering off SEO and into usability)