@JoBlakely generally don't, but while I used to see them as a "solution looking for a problem", I've come to see the utility.

Anecdotal example: Red Cross blood drives. They used to have a bar code for their "Rapid Pass", which is a pre-screening tool that donors can use to save time. The bar code was really difficult to scan off my phone, requiring several painful tries from staff.

They replaced the bar code with a QR code, and it consistently works better.