I have not been to an Orthodox parish yet but I think I know what JamesR may getting at to a degree. I think integrating Protestant practices like Bible School, Sunday school, etc. are fine. There is nothing contrary to the faith about them. Now incorporating actual Protestant ideas, like private interpretation or democratic congregational government of the Church is wrong. Parish councils or whatever they are called in the Orthodox Church allow some democratic or lay government of the Church within the parish, but congregational government is a problem.
As for coffee hours or other American/Protestant things like that, they may be American customs of the Protestant churches, but I think they are more of a general cultural thing. I think they are fine, even good for people to know each other. I do not know why any one would objection except on reactionary grounds. Yes, they may be Protestant and American, but whatever problems there are with American culture I do not think coffee hour after church is one. My problem with Americanism is its disgusting materialism and exceptionalism where America thinks it must be the police of the world, and that they define what liberty and justice are to everyone else. The materialism on the market culture of America, I mean. These are some simple ways I would define Americanism but it is more complex in my opinion and if I really explained myself I would have to be on the politics forum.
Coffee hour is a good way for Americans who are Orthodox do come together in a way they are familiar with, as is a parish barbque, fried chicken dinner, or fish fry. If American Orthodox want to depart from the Protestants a bit they should, like the Roman Catholics, make sure there is plenty of wine and beer at these things. It's important for a parish not just to be a place of liturgy but of fellowship. A church is the one place a Christian can find friends that share many of his views. Yes we can have friends in the world, but it's hard sometimes to fully express our faith. Besides, the Church is universal and brings all men together in fellowship. Yes, the Protestants and Freemasons have hijacked the beauty of fellowship and fraternity, but we don't have to be reactionary and say these things are Christian. However, actual Protestant errors are I think the problem Orthodox must rejection certain Protestant things. As long as there is none of that, I have no problem. We live in a pagan world, and like the early Church, we must come together in fellowship, eating and drinking together. We have to eat and drink with the heathens six days a week. Let us eat and drink with Christians one day a week.