Likewise, in my experience across many different sizes of company I've never seen LOC used as a productivity metric.
The one time I've seen LOC taken seriously was when I've been asked to produce a LOC report as part of a due-diligence audit of a codebase prior to acquisition - that's largely because the line of code count of the codebase is indicative of what code IP auditing/security auditing/localization might ultimately wind up costing the acquiring company so they're using it to figure out entries in the liability column, not even valuing the codebase based on LOC count.