My system is pretty locked down with several levels of virus/malware/pop-up protections and I get zero pop-ups and the screen I see is much less cluttered than when I visit on a different system.
It isn't always as easy for me to browse places as you might think, a lot of time my sensors alert me and don't let me go forward.
I'm a bit on the excessively paranoid side of internet personal privacy/security. My husband is incredibly lax with his system (we have a firewall between us) and he doesn't seem to really get anything that interferes with his sites/system performance... but I get a lot less distractions flashing at me.