While at home I always turn off the location feature on my cellphone (I'm sure I can still be tracked if the NSA so desires but I don't want to make it easier).
However when travelling I turn it back on, for two reasons. One is obvious, it makes using Google maps so much easier because it knows exactly where you are.
But it also tags my photos with exact location, date and time. Which is handy when reviewing them later, even though you can still go in and edit that info.