To be honest, I'm in the habit of driving with my lights on if I'm making any journey (within reason of course), and I must say people do seem to notice you more at junctions and roundabouts (I haven't been pulled out on in a while!) *toucheswood*
I do admit, sometimes if my attention is lacking it is easy to miss a car in the distance with no lights on, but if it's lights are on you notice it a lot quicker and easier.
99% of my Journeys are 80 or so minutes long and involve motorways and dual carriageways so I'm quite happy to do that. Modern cars and DRLs seem to have created a new breed of problems. Recently on the motorway in foggy and very wet situations, I have seen a rise in very new cars with no lights on at the rear, and they have all been the type with fancy bright LED DRLs. I don't know if the cabins on these cars are substantially brighter, but I can't believe people drive around in poor conditions with just DRLs on.
This leaves the rear completely unlit (until they turn the headlights on), which startled me on a foggy motorway which made a car completely appear out of no where.
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One thing I have noticed, having recently bought a new car, is that the dashboard light behind the speedo is on all the time. On my old car, this light only came on when the exterior lights were on. Therefore it is not so obvious now from the inside when my exterior lights aren't on - this may help explain why people seem to forget to put their lights on these days.