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I hate that, too. Without wishing to state the blindingly obvious, bike lights have got way too bright. I got a new one the other day and the lowest lumen count they had was 250. I was happy when I found one with 80 lumens somewhere else.
When you say 'riding behind', are you talking specifically about rear lights? I always try to get ahead of them. I don't find that problem too bad in London, but I can't ride behind blinding rear lights on overnighters. I can't see anything but a red (possibly flashing) barrier.
I've been getting really fucked off with people using what must be mountain bike lights for commuting. I can't see fucking anything when riding behind a mini bloody Sun.