Is the Browser the New WYSIWYG?

I’ve been thinking a lot about this concept lately. Have we come to a point where the Dreamweaver style IDE, (integrated development environment), has become a thing of the past? Ninety percent of my formal training has been heavily dependent on this model, yet I can’t see any forward thinking web designer/developer continuing to rely on it. In many ways, the browser has become my WYSIWYG of choice. You can quickly see the effects of changes made to style sheets and you’re not confined to any one proprietary system.