Our friend Wolfgang Simson, likes to say that programs are what the church is reduced to when they don't know how to follow the Holy Spirit!
The main difference between meeting in a house and simple/organic church is that we learn to follow the Holy Spirit when we get together. The key verse we refer to is 1 Corinthians 14:26 which says, to paraphrase, when you come together, everybody has a contribution to make.
Well, my brothers and sisters, let’s summarize. When you meet together, one will sing, another will teach, another will tell some special revelation God has given, one will speak in tongues, and another will interpret what is said. But everything that is done must strengthen all of you.
The Lord is the MC of our meetings. He has his plan for our times together. He knows each person present, and their needs. He understands the Father's purposes for our church and our responsibility within the Kingdom. The Holy Spirit is like the conductor of an orchestra. If everybody plays the same melody all the time, we miss out on the symphony that the Holy Spirit creates as he leads each person individually to bring their own contributions. We are the body of Christ, each with out own personalities and character. We are not looking for conformity but diversity and a gathering where Jesus is truly head allows everyone to participate as the Holy Spirit leads.