Lately I've been experimenting with whitespace sensitivity in my template language (Jade) and precompilers (CoffeeScript, Sass, etc.). My initial reaction is that I love whitespace sensitivity! You don't have to type nearly as much, and you don't have to worry as much about the coding style of your collaborators because a lot of the style is enforced as part of the syntax. After giving it a lot of thought, however, I've decided to back away from it.
So, despite my love for it, I'm giving up whitespace sensitivity in my frontend coding. I think it's the right choice if I want to easily collaborate with others.