I would love the ability to learn languages quickly. I envy the people that can. Communication skills are extremely empowering. The more languages you learn, the more you can communicate. It's really a very simple idea on the surface, but I think about it a lot.
You see, we live in a world more connected than ever before. We have incredible opportunities to learn about people on the other side of the planet. This only becomes difficult when you run into a foreign language. I find language barriers to be frustrating. Language is more than a way of speech, it's a way of thinking. Learning a new language opens you up to seeing the world in a slightly different way. Combine that with cultural studies and you'll do even better.
Another reason I would like to master languages quickly is so that I no longer have to read translated texts. I always worry about what's lost in translation.