I use it a lot.
For instance, I can hop from a page on the internet to the calculator and back without ever closing anything. Its for good for multitasking.
However, I would like to see it have the ability to open something that you haven't recently used but really that's not what its for.
But I find myself at times wanting something I haven't recently used and having to just close that program and open the other and then I can hop back and forth.