One field where it works rather well is in semantic data extraction. Do you remember the dream of semantic web? Having access to structured information from unstructured sources, auto-matching API functions and arguments to make interoperation easier. We can do that now.

Here is a sample where I used my own post (just copy pasted the raw text from the browser) and got this schema

    comment:
      meta:
        points:
        author:
        time:
        action:
          parent:
          next:
          edit:
          delete:
        post:
      content:
      action:
        reply:

It also guessed it was a Hacker News comment by the formatting of the meta section.