Rebecca Brightly writes wonderful articles on Lindy Hop. This one on why "Nerdy People" dance certainly applies to tango too. Here's a taste and a link to the full article below:
10. Dancing helps you get out of your head.
Thinking is awesome, k? But instead of being constantly wrapped up your thoughts (like when writing your dissertation), do fun stuff. Frivolous stuff. Cool stuff. Just-because-you-want-to stuff.