When I was doing bare metal programming I was doing this all then time, depending on what I was doing maybe even tens of times an hour. And it's not just source code either, these days even debugging tools print values in this way making it a total PITA to reverse engineer things because you can't easily match values coming in from different tools, or from the tool and source code, etc.

I've done it for error codes but that was awfully cursed

But you need to search for both hex and dec codes for that

Yup which is still a one liner in grep

You can grep the snake case too in one grep

You can do almost anything in a grep