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Generate a large number of strings and maps programmatically in compile time.

You are pretty much limited to macros and macro-like languages (llvm-tablegen) if you want to do this today.

You can also do the same with templates quite easily, but the resulting compile times are going to be absolutely atrocious.

A bunch of constexpr stuff since C++14 onwards have been added just to make meta-programming more usable.

Users, library writers, and compiler writers all benefit from this in some way.

Maybe I'm just not imaginative enough but what sort of use-case is this sort of thing for?

Parsers, and any text heavy application really.