You get to see and venture more places
Many will argue that traveling with group tours required them to wake up six or seven in the morning every day. Well, it is true there are many travel companies still practising that old habit but there are new travel companies that are offering more relaxed traveling schedule.
That is the ugly part of the story but you get to see and venture more places. With an arranged mini van or bus, you get to travel to designated places easily without spending much time on public transportations.
I still remember I only visited two tourist attractions in Kyoto and spending the rest of the time connecting bus to bus, train to train. We could have visited more places in Kyoto if we followed the group tour.