Nah, that's no biggie. Straighten the overload (block of wood and a 3 lbs hammer!) and it'll be fine until you can get the spring off to replace or repair. You can fix that spring pack pretty easily unless the springs are actually bent.
They can even be fixed if they break in two...
You could have the other person's insurance adjuster look at the damage if they want, but I would just suggest to the other person that a new bumper and springs might be a few hundred dollars and see if they just want to cut you a check instead of involving insurance. I would go over the truck well in the daylight to make sure you haven't missed anything else, though.