We do a combination of all the things mentioned.
Label each charging device, put each in a zip lock to keep cords from tangling with each other, and I usually put all the gadget type things with the chargers in a gym bag that I can carry to the camper when preparing for a trip. I also have two outlet strips connected together on a small piece of plywood so that they are easy to manage in the place I keep it in the camper.(I have a lot of cameras which have spare batteries and each different camera has a different charger, and they require a lot of outlet strip space)(there again a label maker is a big help).
We have so much stuff to take with us on our trips, checklists are a must....especially for the gadget stuff with all the chargers, etc.
Nothing worse than getting to a location and discover you forgot something that is not easily obtained at that location.