I stopped using Firefox as my main browser when I got a mac a little under 4 years ago, and started using Safari. I was using adblock prior to that switch, and while I don't have any ad blocking now, except for the fact that pop-ups are blocked, I am barely ever bothered by an ad. I'm fairly convinced that ad obtrusiveness has gone down in general over the past few years. There are some exceptions (I'm looking at you, weather.com), but in general people seem to have realized that they had to tone down the ads if they wanted people to see them at all.