I've done this for years, quite convenient. I also have an NFC tag with the WiFi which works quicker (no need to open a QR scanner and no need to focus on the image for a sec) but I'm not sure if iOS supports it. I've put the tag behind the wifi "frame" so that you can just tap it instead of scanning it.

Android also has the option to "share" wifi via a QR code from the WiFi settings menu. It is quick and much easier than reading out the password to someone else.