I think a UI with well thought out transitional animations certainly enhances the user experience. It might be slower than just switching to a new window/view/f

I think a UI with well thought out transitional animations certainly enhances the user experience. It might be slower than just switching to a new window/view/focus, but it helps the interface seem more intuitive. The rapid expansion/zoom that iphone apps do when you open them, for example. As for slowing things down for no reason, no. I don't think anyone enjoys having their time and attention put on hold.