One of my professors once speculated that there wasn't a temptation in Byzantine Christianity to pentecostalism or some other form of 'enthusiasm' because of the richness of its liturgy, along with due attention to role of the Holy Spirit in our lives.

OCN: Recovering the True Spirit
Journeys to Orthodoxy, we meet Barnabas Powell, whose remarkable spiritual journey to Orthodoxy included many years in Pentecostalism as a pastor and ministry leader. After finding the Orthodox Faith, Barnabas served for several years as the Media Director of the Orthodox Christian Network. He's now a priest of the Greek Orthodox Archdiocese. (mp3)