Instead of just looking at the Dish Network GoogleTV page get it from the source:
Google TV
The idea of GoogleTV is to put it between your 922, or even your FIOS box, and your TV. Instead of using the FIOS UI to control your TV, you would use the GoogleTV to search for video content from your FIOS Live TV, stuff you might have recorded or is on demand from FIOS, or out on the Internet. The widgets you spoke of might duplicate some of the functionality that you could get with GoogleTV apps, but imagine MORE of those widgets as separate GoogleTV Apps that are written by Android and Web developers instead of being written and vetted by Verizon. You don't need to have DISH Network to get a GoogleTV. So for the examples I've given, I'd replace your FIOS box with my 922 and get the same functionality.
DISH Network just has a formal agreement with Google to allow integration between GoogleTV and DISH's line of receivers. And they are also manufacturing their own GoogleTV box much like Logitech has licensed to bring GoogleTV to everyone else and putting them in Best Buy Stores. Sony is integrating GoogleTV into their TVs eliminating the need for the extra set-top box in between. GoogleTV will work with any other TV provider, just to what degree is the question.