I don't know about Finder tabs (time will tell), but in Safari, tabs have proven to be quite useful. However, only recently did I discover the tabbed window in XCode 4.x Not only has this feature in XCode vastly improved my productivity, but it also seems a lot faster. And nothing keeps you from opening an occasional throw-away window that you can move independently. Soooo nice.
6/13/13 at 4:20pm