My comments below probably won't add much to the thread, but more of me just "talking" out loud.
I read the entire thing, and rather enjoyed it. It made me a little embarrassed as I fit into a couple of categories. I'm a new rider and my 2005 FZ6 is my first bike. I had 0 experience driving a street bike and one solid day on a dirt bike a couple years ago. Other than that, I've logged a fair number of miles as a passenger. So... very inexperienced (practically unexperienced).
I picked this bike based off advice from some local friends. I think their advice was good, and I hope I'm ok with what I have. I'm aware that more of the problems (responsible) motorcyclists run into (much like bicyclists) don't necessarily come from themselves, but from what goes on around them. Situational awareness is so incredibly important when you are difficult to see, not surrounded by a bunch of sheet metal, and balanced on two wheels. To that end, my first couple of rides so far have mostly been on my local residential streets going around 15-22 MPH. I'm taking the time to learn how the bike responds with the advantage of nearly zero traffic. Riding in a straight line, working through gears, is trivial, so my my focus is on understanding how to turn (since this is what you can't learn in a car, and a bicycle only gives you a hint of what to expect) and how to stop. I'm taking it slow. I'm focusing mainly on one thing at a time. I'm listening to the advice and instructions given to me by experienced riders. I'm reading up on safety and technique. I'm not being afraid of the bike, but I'm giving it a HUGE bit of respect. I know it can hurt me... badly. I know it can kill me. I know it's up to me to make sure that doesn't happen.
One of the things that was interesting in the article was talking about racing cars. There's one of the parts that I line up with.

I don't race every weekend, but about a dozen times a year I'll do autocross (it's precision driving around cones in a parking lot, typical speeds are in the 30-40s and tops speeds are 50-70). I race in a '99 TransAm. That has about 360 HP and over 370 lb-ft of torque in a 3600 pound package. That puts my new bike at about 70% higher power to weight ratio, but substantially lower torque to weight ratio. My car runs the 1/4 mile only a little slower (mid-12s) than my bike does. I've also raced in a handful of Corvettes, so I know what a mid-12 second car feels like. So I've experienced high acceleration and high gs. I know what it feels like when traction starts to give out and what it feels like when it completely fails. Unfortunately, all that experience is in the safe environment of 4 wheels, where the worst that happens is a spin out on course. Does any of this make me more qualified to drive a higher HP motorcycle? Probably not. But it has helped me to get through that phase in my life where everything has to be about going fast (being 37 probably helps too).
I think (or at least I hope) that one of the keys that makes an inexperienced rider successful with this type of bike isn't saying that they are responsible and mature, but actually being that. It's about having respect for the bike. It's about KNOWING you lack the skills and experience to drive it well. It's about taking your time to learn (not just in a one weekend class, but over months) and not pushing the boundaries. I have the rest of my life to go faster, today I'm going to go slow.
FWIW, I am signed up for one of the local basic rider courses, but they are booked pretty solid this time of year. It'll be a month before I get in. Until then, I'll be practicing the basics in light traffic, on roads that I know well, at lower speeds, and paying respect to the tool I wield.
Assuming I do well at this and my bike turns out to be a great first one, don't believe that I will come back and say that it's a great first bike or that anything posted here was wrong. You have me convinced that most people (probably myself included) should be starting on a less powerful bike. And people that use excuses about how they started with a 600cc sport bike because they need to impress their friends... they're the ones that should be pushed the hardest into an easier bike. Don't try to impress anyone... except maybe your parents by showing them how responsible you really can be. A bike, like a car, is a vehicle (both having the potential to be deadly). It's not a toy.