Re: Some text editor fanboi war this is...
Vi has had that feature as far back as I can remember. On the other hand, it's not a good thing to use if you intend to post-process for formatted output (typically using nroff). The standard practice with vi was to type in phrases with newlines between them. Makes editing easy and tends to produce cleaner writing. WYSIWYG processors tend to make people run off at the keyboard in long, convoluted sentences.