If you want privacy, you go much further than what Apple gives everybody in Safari already.
E.g. Google Analytics will track you extensively throughout the entire web as far too many website use it for analyzing their little website. But Google will have the big picture of you navigating +90% of the time. And they could use/sell that data as they see fit - some laws might prevent them - or not.
It's far easier and much, much safer for your privacy to make sure these trackers are blocked so they don't have the data and hence can't track you from the onset.
Viewing ads should not give a privacy issue, except for the way the ads are delivered: again those delivering the ads have a pretty good picture of you all the time, just by delivering their omnipresent ads. So again: better to prevent them from tracking you and doing something later with that data than to hope some law or some ethical considerations might stop them in time.
So:
- Ghostery is a VERY good idea.
- Uninstalling Chrome and any other Google tools: same very good idea (also nuke their "updater" - it consumes way too much resources constantly to be considered "good")
- An ad blocker: same
Those deep into privacy (to the point of anonymity) and the like would go even much further and use things like a VPN service to make their use of the web more anonymous or even go as far as using TOR. But there are significant drawbacks to go that far: it's really, really slow and often you end up together with those up to no good so you get blocked much more often.