As Tom notes In different parts of the World you have different anchoring and beaching situations. We Carry a dinghy if going on a cruise--but usually not for Day trips. If I was in Alaska, I would carry it all of the time. First it is your life boat! If you have dogs it is a good way to get them ashore. When anchored, often it allows you to access other areas. For example on Lake Powell, you cannot hit the phone, Marine VHF, 2 meter ham repeater unless you can see it. So it is much easier to take the dinghy out to the center of the lake and get the connection you might need--including in an emergency--which we have had to do to get life flight into. the place where the person was severely ill or injured.
We carry it inflated on top of the cabin, delfated in the same place. We leave our inflatable in its container. That protects it from the sun and UV radiation, which breaks down the PVC plastic on the dinghy. We have a tutorial in my photos (or did have) on using the Garhauer Davit to hoist a 9 1/2" air floor, about 70# inflatable onto the C Dory roof. The dinghy can also be brought aboard over the bow. Ranger tugs have a great system to pull the dinghy up and over the outboards where it rides upside down.