This is exciting. Apple Maps started out disastrously, but has steadily been improving to the point where it is an already great app. It's now by far the most used mapping app with iOS and is used by hundreds of millions of people a month, to the tune of many billion times a week.
The increasing importance of mapping is not well appreciated by most folks, but there's a reason Apple has been investing billions in AM and has thousands of people working on it-- technology is making it feasible to map the interior of every building, so if you use Google maps they will have even more data about every single place you go to, where you stop, shop, who you visit, etc. For example, now Google Maps collects and stores the data that you went to an office building, but soon they will be able to add to your "Universal Identifier" that you went to a particular doctor's office, or a particular particular apartment in a building.
Thankfully, Apple Maps will continue to be an alternative if you don't want Google to know and control every intimate detail about you. Keep in mind also, that the dossier that Google is amassing on people is available to hackers, law enforcement, intel agencies, successor companies that Google might want to sell it to, and of course, indirectly to marketers, advertisers, etc.