You say "if they're not intrusive" well what's the line? A "you can't read this unless you disable Adblock" is definitely intrusive. It's a complete intrusion into what I wanted to do, which was read an article, and now I'm watching ads that affect my habits and behavior. That's fine though because that's equal in value to the content I was getting? Absolutely not.
You'll always be subject to some form of advertising. Like I don't know if you have a subscription to Readly or anything like that. How do you feel about these digital magazines with the pages that would have been printed dedicated to 'Creed Viking' or Rolex Oyster, Mastercard etc? You didn't ask for them, they're just there and you have to flick past them.
Or actual print newspapers? Did you close your eyes or have the papers abridged first of all advertisements? I mean you only wanted the informational content right? Even if you pick a newspaper up off the media stand and flick through it, it's basically the same. On some of those pages there will be ads that you see.
I value a free and independent media so I don't mind chucking a few quid here and there. Unfortunately that means accepting there exists, a platform for the likes of the Mail or the Sun, so I give my business to the publications I want to persist. I'm not judgmental over anyone that doesn't or chooses to run adBlock everywhere though. People do what they want.
However, you can't really complain when someone says 'I've created all this content, and to view it, you have to sit through a few adverts'. Switch it off, see if the ads are obnoxious. If they are you know never to visit again. The need for adBlocker wouldn't have been there if advertising didn't go OTT, but largely the issue on reputable sites has been resolved. adBlock has its uses for things like streams, and less savoury sites......