My parish is mainly cradle Orthodox (Greek)...and I've attended an OCA church, and also a Serbian church, both of which were mainly converts. My observation is that the converts are more participatory.
But that is a totally different story with pilgrims at the monastery, which is mainly all cradle Orthodox. But truly, that place is a little piece of heaven on earth. I remember the vigil I went to last year (the Annunciation)...there was an elderly Greek woman there who was standing catty-corner from me. We were all squished together inside the little church for this six hour vigil. This woman was in a different world. I think she wept the whole time. And I remember the way she made her cross, and prostrated herself....and I thought to myself, "What she has, is what I want." I didn't take my eyes from her the whole time practically. I just stood there listening to the chanting, praying and watching her. I'll never forget her. I wonder if she'll be there again this year.