Swamp Yankee,
Deacons today serve the Church in many ways. Their primary role is to be of service within the community in accord with their talents and callings. Deacons assist priests in formation of ministries, counseling and support of couples in marriage preparation, individuals seeking annulments, formation of prayer and study groups, teaching and in many other service roles. Deacons also assist the priest at Mass. Ironically, that is the contact that most Catholics have with deacons, but that is not their primary role. Their primary calling within the Church consist of what they do for the people outside of Mass. The primary calling of priests is what they do within the context of Mass.
Deacons may preside at some liturgies, and they can confer some of the sacraments. Deacons may give homilies in certain circumstances, and it is their role, when assisting at Mass, to proclaim the Gospel. Deacons may preside at weddings (without Mass) and at funerals (without Mass). Deacons baptize children. Deacons can preside at prayer services , such as benediction, communion services and others. Deacons can bless objects, such as rosaries, religious medals, homes and cars, as well as any priest can. Indeed, the only things that a deacon cannot do are: say Mass, hear confessions, and confer the sacrament of the sick. Those are reserved to priests and bishops. Also, deacons cannot confer the sacrament of confirmation, which is reserved to the bishop, although he does, upon occasion, delegate that to priests.
In short, deacons allow the priest to devote himself to those responsibilites that are unique to his ministry.
If you think you are hearing a call to the diaconate I encourage you to contact the vocations director for your diocese to find out more.
God Bless,