I block the google analytics at DNS level at home. However, don't use a Google product such as Chrome as it will totally ignore your DNS settings. There is also an issue of some webpages not loading because its waiting for google analytics to finish loading. So I normally re-direct the data to an internal server in my net that captures all the traffic, which will allow the server to finish loading (also allows me to replace image Ads with Jolly Rogers images).

The issue with this is that the DNS settings only apply at home. And most mobile devices totally ignores the DNS settings as well, using the one provided my my carrier instead.