My Google Drive has a large number of documents at this. Occasionally, I'll want to look at various statistics about the documents I've created (e.g. total number of pages I've written, total number of pages in certain selected documents, etc.) How do you do that? Is it even possible?
I don't think you can check multiple documents at once, but to find statistics for a single Google Doc try
Tools -> Word count or Ctrl+Shift+C