Pairing is "extreme programming's" (XP) peer review. I'd probably replace Pairing with something that's inclusive of both Extreme approaches as well as run of the mill code reviews.
i specifically value peer review in the form of daily pair programming. i am six months into my first experience with the practice, and i currently value it much more than distributed asynchronous peer review (eg github pr)
At my startup, we don't have the luxury to spend time pairing every day. I agree it's a great practice though.