- it was shown off at the keynote last year https://youtu.be/TfRMXk53wPY
- I believe the tips app will mention it to you
- they have support articles describing it https://support.apple.com/en-ca/HT212630
- any text field you're in will let you scan text directly from the camera.
Granted, maybe they could go further to show people when they go into the photos app or something, but it's definitely a very highlighted feature relative to others.
Their Google-street-view-like feature is just an unobtrusive link that says "look around" or something like that in their maps app on the iphone. Never mind that this is a massive amount of work, and that they're in the process of mapping all of Europe, and I assume the US.
They rarely throw "check out the new features!" dialogs on upgrades. (Sometimes they do, but it's rare relative to the # of new features.)
It’s also in the Tips app, which is great to go through from time to time!
BTW, you can switch it off globally easily - it's in language/region settings on both iOS and Mac.