"Is this normal across the board for the GOA?"
Yes, it is. Sigh. I've lived in the Chicago Archdiocese and the Denver Archdiocese, and the same practice takes place across the U.S., as I understand.
"I felt a little awkward being the only one standing and I could hear some little old ladies whispering about why I wasn't kneeling (I didn't take offense at all though). Cheesy"
Don't feel awkward. When I attend the local GOA parish near me, about 90% of the congregation kneels. The Serbs and Russians (and a few converts familiar with the canons) stand. Everyone is at peace - at least in this parish.
"A few months ago I talked about this with a friend of mine who said that sometime in the mid-20th century the GOA tried to make itself look American and adopted a lot of Anglican things, such as the clergy collars, organs, kneeling, etc. Is this true?"
Well, those aren't specifically Anglican things - you could just as easily say they were Catholic or western things.
The way it was told to me, a lot of these changes were adopted after WWI and around the 1920s, during the split between Venizelos and the Royalists. The entire Greek church split for awhile over those changes, the calendar, kneeling during the Liturgy, etc. It took a long, long time for these two groups to be reconciled.
I've had some priests admit as much to me that the canons state that we shouldn't kneel during the liturgy - but that the Greek hierarchy in the U.S. keeps insisting upon it.
"Is there any move to get rid of these "Americanizations" or what have you?"
Well, such a move *could* be perceived by some Greeks as having political/historical implications. Or in my case, it could be perceived as another "xenos" convert telling lifelong Orthodox "to do things the right way." So at least this "xenos" convert has kept his mouth shut.