I pretty much agree with your sentiments, and that other people may not think the way I do, and that's cool. Obviously a lot of sites rely on advertising to survive, and since they are surviving *someone* is seeing/watching those ads. It's just not me. And honestly, not to sound like an ass, but as long as I don't need to see them I'm good.
And I'll even admit there are a few (VERY few) sites where I don't block the ads because I want to support the site and the ads are extremely unobtrusive, so I can live with that. I use a lot of ad-supported apps on my phone/tablet, and I'm generally ok with that too so long as the ad is unobtrusive (I remember trying to play Angry Birds and the ads popped up in such a way that made the game impossible to play; deleted that shit real quick and never looked back). I have a buddy who sells a few basic Android apps and originally went with a 99 cent price with no ads. He wasn't getting a lot of purchases and then decided to offer a free version with ads and he makes over 10x the amount of money just from those small little popup ads. So, hey, more power to him.
For now most of the app ads are unobtrusive, but the web was once like that too. When things start to change and get out of control that's when it's going to be time to look into adblockers for my phone and tablet.