Right now using ad blocker significantly improves quality of browsing. I cringe every time I fire up a browser without adblock by how disruptive and annoying ads are.
For example, I read a story on cnn.com, and even though I have Ghostery enabled, I am still swarmed by "Share This" (on Facebook or Twitter or Google+ or LinkedIn...) and "Print" and "Email" buttons and "Search Powered By Google" (twice!) and "health resources by HealthGrades" and "CNN Trends Fueled by zite" and for some reason, the weather in Atlanta, even though I live in California.
And then I click the Safari Reader button, and all I see are the text and photographs. Pure zen.
My theory is that websites iterate "what can I add to make people stay here longer" and thereby accrete crap. If there is to be a better way, I hope it removes the incentive to add this junk.