No. People are using Google Docs for (some) new documents, because it handles collaboration far better. When you are using Windows or OS X, you can use both.
It's indeed becoming a thing of the past. Unfortunately, the web version is not there quite yet feature-wise. But it's definitely getting better all the time.
I suppose I shouldn't speak for the editing side of things. If I do editing, it's basic Word and Excel stuff. It has been perfect for viewing though, which was what used to keep me stuck with an Office install.