Speaking several languages gives you some advantages. You need to automate the distinction of complex sensory patters to the point in which it become effortless(after lots of practice).

You create complex neural networks that process this sensory data.

It is incredible how we see an image with text on it and text just pop out effortless in Mandarin or English, Russian or Spanish.

But IMHO, it is not speaking spoken languages that will give you an edge, because they all are similar, but knowing the different languages of very different fields.

For example a Musician speak the language of Music, tones, frequencies,Harmonics. It works in the same way, after lots of practice it becomes second nature to understand complex patterns in the world.

There is a language of science, understanding orders of magnitude, entropy, energy, numbers in general, experiments, errors.After lots of practice, it becomes second nature to you understanding those patterns.

Someone who works with people or animals like dogs could anticipate what they are thinking (or what they will think in the future), just by looking at the body language or speech nuances. After lots of practice, it becomes second nature.

Programmers learn a computer language, and after years of practice, it becomes part of who they are. There are Holy wars in programming because people that master a language feel threatened when this language is attacked, is an attack on themselves.