I have both a cast iron skillet and a cast iron dutch oven, both of which I would defend with my life. As others have pointed out, they're way too heavy for packing, but for car camping.. ahhh, just the ticket. Nothing better, IMHO.
I've been using cast iron for many, many years, and I've learned some things (read some, too).
About seasoning: seasoning is the single most important aspect of using a cast iron skillet. When you first get it, clean it really, really well before you do anything else. This should be the last time you ever use soap/detergent on your skillet. Once it's really clean, wipe the inside with Crisco or lard; yes, other oils will work, just not as well. Once it is coated, heat your oven to 350º F. Put the skillet in the oven, close the door, and let the skillet sit in there for an hour or so. Turn off the oven and let it cool WITHOUT OPENING THE DOOR OR REMOVING THE SKILLET! Once it has cooled down you can remove your well-seasoned skillet. Nothing should stick to the skillet if it is seasoned properly. You will have to re-season from time to time, but don't wash it with detergent first. How do I clean it then?
About cleaning: all you should need to do to clean a well seasoned skillet is rub it vigorously with salt (large, rough, margarita/kosher salt is best). The salt is abrasive enough to remove anything in the skillet without hurting the seasoning. If it doesn't, your skillet wasn't seasoned well enough. Once you have wiped it down with salt, wipe the salt out and then wipe the inside with cooking oil; now it's ready for the next time you use it.
Yeah, but what about disinfecting it with detergent? Well, what I've always read is that the salt should pretty much take care of that, but even if it doesn't, heating it for your next meal surely will kill any nasty critters that are still on there.
Enjoy cooking with your cast iron, just don't try to pack it in on your back.