I'm an Android user, so I can't really comment on the iOS experience, but for me it's as literal as "hit barcode scanner, point camera at QR code". The app detects the QR code, decodes it, tells me what it found, and asks what I want to do with it. In the case of a URL, it pops open in my browser; in the case of an app URL, it opens in the Play store app, etc. It's very quick, easy, and painless.