Not sure if you are asking me or heipei. For my project, it shows the requests on a map, where the requests in dev tools aren't geolocated and mapped. Same basic principle, just a different view.
I'd call it more interesting than helpful (not that it's not helpful). It gives insight into how a web page is actually built -- while I'm sure most readers here understand it, that's not true for the general population.
It might make developers think twice about how they build sites if they could see how overly complex they get. As I mentioned, the Houston Chronicle site used to require about 4x the number of requests as it does now so someone did some optimization.