I do use an adblocker, but even before I did, I think I'd just used the web so much that it was almost like my brain had gotten used to the general pattern/shape of ads on web pages to the point where I just unconscionably ignored them.
On a related topic from that link, I don't think I've ever come across a banner ad made to look like a dialog box that has been good enough to fool me. But again my experience seems to suggest that those with less computer experience are far more easily fooled.