Many people I help with computers have no idea what a add-on is. If they do have it installed it gets turned off completely as it broke some site. They do not even know what a browser is let alone which one they are using.
I run uBlock Origin too but do continuously think about how I am not supporting the websites I get value from. Some I donate to or use Pateron but I could not possible donate/pay everyone I get value from on the web. So may be some people make the choice not to run a ad blocker.
Just because you do not see the results of being followed does not equal you are not being followed and receiving a less obvious tailored experience with tailored pricing for example.
As time goes on Ad people are getting smarter and are not making it so obvious that they know you in a unique way and will be more subtle in pushing wares / curating a web experience for you of their choice.
Start of the rabbit hole: https://panopticlick.eff.org/