An interesting thing I've noted on disabling personalized advertisements: My SO, who has personalized ads on and lives in the same household, sees ads based on my behaviour. So the ads aren't personalized to me, but they certainly are to my SO.
I'm not sure who gets the worst deal from tracking, the companies buying ads or us having to see them.
That said, I have heard a few times comments mentioning that it's easy to filter out (from the ad provider side.) I hope not, but if it is, I would only hope someone smarter than I would send a PR. :)