How do "normal people" scan these QR codes into their computer?  I keep seeing requests for QR codes, for example, many people would prefer these over printed numbers for bitcoin private keys on my coins.  But I don't understand how they're any easier than typing them.

Sure, everyone's got a smartphone that can read them.  But unless they're going to somehow use their cell phone to do the import, they're going to have to just type them in anyway.

Is there a popular QR code reader for webcams that everyone is using but that I just don't know about?  If you had a private key in the form of a QR code, how would you get that code into your computer without having to type it?

I paid $400 for a handheld laser reader (USB), and of course it makes QR codes very convenient, but somehow I highly doubt this is what most people are doing.