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22 years writing C professionally, 17 years writing C++ professionally, much longer than that if you include hobby projects, and I started an open source C++ library (https://github.com/facebook/folly). I interview C++ programmers multiple times a week. (We're hiring: https://rockset.com/, https://jobs.lever.co/rockset)
To be truthful, I think that knowing template metaprogramming are certainly good to know in the long term. They can help you make your libraries more robust to different scenarios, do compile-time assertions, avoid code duplication in an efficient manner and even create your own DSLs which can greately improve readability when applicable. And libraries are not only for public consumption, they are also for private consumption and the same standards apply. Eg example from a previous project: https://gitlab.com/new_dexterity_athens_public/nd_api . This uses template metaprogramming and some macro hackery to create zero-cost and safe access to an embedded device that provides a dynamic api. We actually made that for internal usage in order to write tools robustly. The pattern in the article is called type_traits and is applicable for a ton of things.
In this example, I just use templates to avoid repeating code but keeping the strict type enforcement. Here I do the same but with recursive templates.