Is it not true that the Eastern tradition sees salvation as a cooperation between God and man? As such, it is a syncretistic operation involving the melding of the will of man with the grace of God.
This is a syncretism that I reject, choosing instead to proclaim that "Salvation is of the LORD". I consider that my salvation is the work of the Holy Spirit in changing me from the worthless worm that I was into a son of the King. I had no desire to please Him until such time as he changed my desire.
I'd say you're close but not quite on the money here. The Eastern tradition holds that God extends grace and man accepts it. That's not the same, to me anyhow, as a 'melding' of the two. Without God's grace extended to all, it wouldn't matter what man wanted.