For me the best use of Widgets are toggle widgets. Toggling sound settings or wifi or GPS is handy. The best toggle however must be lock screen toggles. Being able to toggle the lock screen on for security when going out and then being able to quickly toggle it off for when you're using your phone at home makes life easier. That's one thing that i sorely missed.
I've never understood this mentality with iOS. Why are people turning these features on and off all the time? I just turn them on and leave them on. iOS handles wifi and GPS on it's own; there's no need for the user to get involved. As for sound, there's a switch on the side of the phone.