Let me answer that:
We can toss a dirty bike or 4-wheeler in the bed. All the fishing gear, tent, coolers...etc. I can throw stuff from home depot in there and not worry about messing up the interior. It can do all of that and still tow the boats or more ATV's on a trailer.
We can toss all the bikes in the bed and go biking somewhere away from home. You can put all the luggage for weeks away from home in there, no problem, and nothing encroaches on the interior space, which is generous and extremely comfortable.
We've owned three vehicles with three rows of seating but since we only have three kids, it was never an absolute necessity, it simply made things a bit easier to prevent fighting. If we had four a truck wouldn't work, but we don't and we've found the truck is the better fit as the kids have gotten older and we are doing more extracurricular activities.
I grew up with wagons, my parents owned two of them and while they were more versatile than a sedan, they were nowhere near as capable as a truck. As long as your occupancy requirements don't exceed what a truck provides, it's the more flexible and more capable choice.