I converted to Orthodoxy from Evangelicalism, with a period of outright atheism between the two, and I would absolutely say that the full sacramental life of the Orthodox Church is what was missing in my Evangelical experience. Our Lord made it quite plain that, "Unless ye eat the flesh of the Son of Man, and drink His blood, ye have no life in you." And my baptism, chrismation, and first communion were deeply mystical experiences for me, when I felt a tangible difference afterwards. I am quite, quite far from being anywhere near perfect, but my communion with the Holy Trinity has been so much deeper and fulfilling than at any time when I was a Protestant.
I'm actually thankful for my evangelical upbringing, because it implanted within me deep desires for communion with God and a fruitful spiritual life. I became an atheist because those promises and longings were never fulfilled in any protestant expression I could find, and, not knowing about Orthodoxy, I assumed that Christianity was a fraud. Orthodox literally saved my life.