The place I usually encounter QR codes these days is at airports (in Italy) where they are used to issue directions such for how to get to the next terminal or where the car hire location is.
And the thing that strikes me is... I have to open my phone, load an app, point the camera at the QR code, wait for a site to load where I will then get a piss-poor web design droid's idea of what is "useful" information including some very poor maps with no reference points that I can't begin to interpret. Of course the real point of this is to capture data about me and what services I will pay for.
OTOH a sign saying TERMINAL 2 --> or CAR HIRE --> works much better including about a meeelion times faster. Pointless cock-wombling technology.