[klibertp]

As other commenters said, you're confusing hype behind Lisp with hype behind FP. They may be related, but are not the same thing.

Almost all currently used languages have some functional programming support. Many "modern" languages are functional in nature, even if it's well hidden behind syntax sugar.

Lisps, and code-as-data, is different, in that it's about compile-time meta-programming and not runtime execution model. There are non-lisp languages which offer similar capabilities, see Elixir and Nimrod for some recent examples.

Anyway, if you want to understand practical advantages of FP you should just use it in practice. It shouldn't really come as a surprise that you can't see practical benefits if you only studied a bit of theory...