Look, I sit in neutral at lights because my left hand cramps up holding in the clutch. I understand the reason behind sitting in first and in theory it's fantastic. But in 10 years, I was only recently run into from behind by a woman that had already come to a complete stop behind me and decided to proceed forward dispite the light still being red. I could have been sitting in first gear and it wouldn't have helped as I only keep an eye on the car behind me until it stops. We'd been sitting for at least a minute then all of a sudden BLAM I'm on the ground. I support staying in gear until the car behind you has come to a complete stop but after that it's a little pointless. I've got like 30,000 miles on 2 wheels, 25k of that in the last 3 years and I have never had to "accelerate away quickly" at a light. Unless you sit there with your head turned looking behind you the entire time, you won't know if you NEED to accelerate away anyway. It's not realistic.
It's like riders who say that its safer to go 10mph over the speed limit on a motorcycle than to proceed at the speed limit with traffic. No, it's not. There is no study that shows that. There are studies, however, that show excessive speed to be a leading CAUSE of motorcycle accidents. Speeding isn't the solution, it's the problem. Lane splitting is an excuse to get ahead of traffic, it has nothing to do with safety. In fact, in traffic you're less likely to get into an accident than if you riding between people's doors at a light.