Google Docs has long been my only word processor.
Although Google pushes the collaboration features, I use Google Docs mostly for editing documents and long-form content. I rely other tools for publishing the finished works. For example, I write the manuscript of my book with Google Docs but format and publish it with Leanpub.
Do you create finished documents with Google Docs or want more control over presentation? Have a look at the tutorial below on adding captions to images.