Found this write up in Wikipedia that made me see clearly why I enjoy group coaching so much.
Universality
The recognition of shared experiences and feelings among group members and that these may be widespread or universal human concerns, serves to remove a group member's sense of isolation, validate their experiences, and raise self-esteem
Altruism
The group is a place where members can help each other, and the experience of being able to give something to another person can lift the member's self esteem and help develop more adaptive coping styles and interpersonal skills.
Instillation of hope
In a mixed group that has members at various stages of development or recovery, a member can be inspired and encouraged by another member who has overcome the problems with which they are still struggling.
Imparting information
Members often report that it has been very helpful to learn factual information from other members in the group.
Development of socializing techniques
The group setting provides a safe and supportive environment for members to take risks by extending their repertoire of interpersonal behaviour and improving their social skills. Group members achieve a greater level of self-awareness through the process of interacting with others in the group, who give feedback on the member's behaviour and impact on others.
Imitative behaviour
One way in which group members can develop social skills is through a modeling process, observing and imitating the therapist and other group members. For example, sharing personal feelings, showing concern, and supporting others.
Cohesiveness
It has been suggesteg that this is the primary therapeutic factor from which all others flow. Humans are herd animals with an instinctive need to belong to groups, and personal development can only take place in an interpersonal context. A cohesive group is one in which all members feel a sense of belonging, acceptance, and validation.
Catharsis
Catharsis is the experience of relief from emotional distress through the free and uninhibited expression of emotion. When members tell their story to a supportive audience, they can obtain relief from chronic feelings of shame and guilt.
