OK, I must be a rarity indeed -- a convert to Orthodoxy who attends a GOA parish! And I've been there 22 years! (In the interest of full disclosure, I admit that I probably would have chosen an OCA parish had one existed in my town 22 years ago. Today, I drive past thriving Antiochian and OCA parishes to get to my parish, which also has its share of "white people" or "Americans" or "Gentiles" or whatever Greeks call us converts. Personally, I prefer "WASO" for "White Anglo-Saxon Orthodox.")
Anyway, yes, we have an organ. I'd rather we weaned ourselves off it, or at least reduced it to the role of giving the pitch, but I don't feel an urge to take an ax to it. My objection to the organ isn't theological. I just think that the best choral singing tends to be acapella.
As for Byzantine chant, I've learned to appreciate it only gradually, after hearing it done -- and done well -- in English; my personal tastes run more toward obikhod and four-part harmony on the Russian model. I praise God for the vast variety of music in Orthodoxy!
As for congregational singing, I can tell you one way to promote it that will NOT work. Ten years ago, a former priest, zealous to promote congregational singing by decree, purchased a setting of the Divine Liturgy that NOBODY KNEW. The choir was sight-reading music it had never seen before, and the congregation didn't open its mouth, so, four or five joyless weeks later, the priest pronounced the experiment a failure.