I came to the same conclusion after my first tour, the first part of which was 93 days on the road with 12 complete strangers. There were a couple of people in the group, including a racist alcoholic, who I would have dumped after the first few days had it not been an organized tour. Fortunately, there were people at the other end of the spectrum who served as insulation, if you will. Only when my turn came to shop, cook and clean common cooking gear (which happened about once/week) and I was paired with one of the people I didn't like was I forced to interact closely with them.

When the group trip ended I spent several weeks riding home solo, so I immediately got to compare it to group touring. While I missed a couple of people in the group who I really liked, I felt liberated being on my own. The primary reason I had chosen a group tour for my first was that I had never done any unsupported touring. The first day of the trip was the second time I had ever ridden a fully loaded bike. That night was the first night I ever slept in a tent. I wanted to learn the ins and outs from others and develop confidence. The solo portion of the trip showed me that I had and made me realize that I would rather be alone than with people I don't like. Since then, most of my mileage has been solo. I did do a few unsupported trips (and two supported ones) with my ex-GF. Strong rider, but she never really took to the loaded biking and camping thing.