I would like to know who is giving dislikes to everyone :D

And I think it is a testing profile as well
My opinion :)

I don't think they have an advantages when they're learning languages. 

I have a friend who's a mathematician (cybernetics) and as Slovak native speaker she had problems even with learning Polish (these language are from the same lang. family and they're pretty similar in real life, too). She tried to learn English as well, but she also failed.
I know that she is a little bit lazy but actually that's a good thing sometimes, because she can find a logically simpler way of doing something, so that makes it easy for her to do. She uses this on everyday basis, so that's making her intelligent in my view. I'm saying this because my math teacher always says "We mathematicians are very lazy, but just because of this laziness we could actually find answers to many mathematical problems."

But when learning a language you don't have many opportunities to simplify something (maybe memorizing words), so I think mathematics and language learning are two different paths.

My opinion :)

If I will REALLY need to learn a language, maybe I'll take that injection. 

But as I see there are many people who learn language because of their interests in a foreign culture, so they "have to" learn a language. In this case (and in my case as well) I wouldn't take that injection.

Because for me language learning doesn't give me just the goal of fluence in a language. But it also gives me experience, it gives me new friendships I've made during learning, it gives me self confidence. Through the language learning process we also learn a lot about other cultures. 
I think these things are as important as fluency in a language.

My opinion :)