It was the Ice side of Dueling Dragons at Island of Adventure back in 2000. I was 9 years old and have a slight memory that we started with Ice after a ride-op saw that and I was really nervous and recommended it as it wasn't as intense. Can't really remember if that was the case but still a nice gesture!
I've got to say that I found Furius Baco extremely rough as well. I rode it in one of the outer seats in the very back. From what i've heard it's supposed to be more comfortable in the front of the train but that first ride made me not wanna go for another ride that day..