I snapped GameDVR (to start and stop recording, so I don't have to cut and recompile later) all the time.
Snapping the Achievement bars of how close to an achievement I was currently also was kinda cool.
Still, if it's really necessary to speed up the dashboard, by all means, snapping be gone. That dashboard is atrociously slow. If it were as fast as PS4, Xbox One would have the superior UI (in my opinion at least).
Setting up a party, invite friends, send a message is all the fastest on Xbox tho. Store loading is the biggest problem really and getting into settings.
Btw all that above you still can do. Like achievements, Gamedvr etc. Its now all in the guide and really fast.