We did a caravan with Adventure Caravans in '08 and was one of our best RV trips ever. Yes, you are someone else's schedule but we had access the things we would not have know about nor had access to at several times during the tour, even if I had read the Milepost.
You can choose to socialize when/if you want to. There is great relaxation in not worrying about where to go and not worrying about where to stay. We had a wagonmaster who briefed us the evening before driving on the next day's destination, what to stop and see and where to fuel up. We had a tail gunner who was the last to leave the park and was there to assist if anyone had an issue and over the course of the 58 days, was needed multiple times to lend assistance or to seek repairs.
I, as the planner/driver, could simply relax and enjoy the trip. Is this for everyone, Nope! We actually are doing a second Adventure Caravan to the Canadian Maritime provinces in 2017. Using them for the same reason - I know nothing about the area,ferries and best sights to see. Could I figure it out - likely. Is the price worth it for us - yes.
If I were to go to Alaska a second time, I would go with friends. We did a "time out" a couple of times where we did not go on a bus tour but did our own thing for a day locally.
Making the decision is not easy as the price tag is big. When I figured out what was included and then how much I would save, the daily price was not very high for ease on me travelling. For us, we were happy with our decision.
Please PM me if you would like any further information or to even chat via phone about our experience. Enjoy your adventure whatever you decide!!