I think there was a column in Motorcyclist or something a few months ago regarding this topic. I think the point was it's a personal choice and opinion whether or not you think High Beams will help or not. I think he (Mitch Boem?) was saying that while high beams do help, use your head about it. If you're behind a car already, you don't need them on High.
My take? I'm usually a Low Beamer. But.... in the twisties, I always put them on High. If it helps to wake up the sleeping cager and keep him from drifting into my lane as I'm leaned over coming at him from the opposite direction, then it's worth it for me to annoy him. In normal traffic though, I usually stick to low beams.
Also (and I THINK this was mentioned in that column), people tend to focus and target fixate on things. If you're blinding some dumb cager with your high beams, he'll aim FOR them (sub-conciously) instead of just noticing you're there and avoiding you.