Certainly, to grow in holiness and in one's prayer life. The following are a few others reasons why the rosary should be prayed often, even daily:
"Among all the devotions approved by the Church none has been so favoured by so many miracles as the devotion of the Most Holy Rosary" (Pope Pius IX).
"Say the Rosary every day to obtain peace for the world" (Our Lady of Fátima).
"There is no surer means of calling down God's blessings upon the family . . . than the daily recitation of the Rosary" (Pope Pius XII).
"We do not hesitate to affirm again publicly that we put great confidence in the Holy Rosary for the healing of evils of our times" (Pope Pius XII).
"No one can live continually in sin and continue to say the Rosary: either they will give up sin or they will give up the Rosary" (Bishop Hugh Doyle).
"The Rosary is a magnificent and universal prayer for the needs of the Church, the nations and the entire world" (Pope John XXIII).
"The Rosary is the compendium of the entire Gospel" (Pope Paul VI quoting Pope Pius XII).
"Meditation on the mysteries of the Rosary . . . can be an excellent preparation for the celebration of those same mysteries in the liturgical actions [i.e. the Mass] and can also become a continuing echo thereof" (Pope Paul VI)
"My impression is that the Rosary is of the greatest value not only according to the words of Our Lady at Fátima, but according to the effects of the Rosary one sees throughout history. My impression is that Our Lady wanted to give ordinary people, who might not know how to pray, this simple method of getting closer to God" (Sister Lucia, one of the seers of Fátima).
The Rosary is essentially the decades and their associated mysteries, and only these must be prayed to "pray the rosary", either in satisfaction of Our Lady's requests, or, to gain the indulgences attached to praying the rosary.
The traditional Rosary is divided into three parts, each having five mysteries: Glorious, Joyful and Sorrowful.
In his apostolic letter The Rosary of the Virgin Mary, Pope John Paul II proposed a new set of mysteries, which he called the Luminous, and which concern the period of the public life of Our Lord.