James 5:16 ...The effective, fervent prayer of a righteous man avails much.
What is the difference between a prayer warrior and an intercessor? A prayer warrior can pray for a thing to be done but does not have to be willing for the answer to come through him. It is not always imperative that you continue to pray until the answer arrives.
The Holy Spirit places a burden on the intercessor to keep praying until peace to stop arrives from the Lord. Normal prayer is talking to God from the mind of the person. When you enter into the area of intercessory prayer, you will be praying with your spirit as well.
Your spirit will be entering the environment of the spirit realm, and will be crying out to the Spirit of God. Intercession must be prayed from the heart, not just as a duty. You pray in behalf of others, and this is far more important than just normal prayer that would be presented to the Lord for someone.