I ride one of the older Buzz bikes (V brakes/9 speeds) but similar frame geometry. I am a tall rider who likes as compact and tight a frame as possible because for a bike to fit me it will naturally have a longer seat and top tube. I used to race and still love the feel of short chain stays and not much rake to the fork. The Buzz does not feel too "twitchy" to me and I often get it up to speed in traffic and am quite comfortable with the handling. I'll add that I use a milkcrate on my back rack, which I load with sometimes as much as 35 lbs of groceries and it still feels good but it is definitely a little sloppy with a full load back there- but that is certainly not a design flaw.
It sounds like you actually liked the feel and handling of the bike. If the fit is good you'll get used to it. Just give yourself some time to get used to it's responsive handling before you do something out of control in your initial enthusiasm.
