Yes, I see people nearly cause accidents everyday. I myself was nearly crashed into just yesterday at an island because the person just didn't look.
I see this on a regular basis on roundabouts where left lane is straight on/left and someone is going right so is in the right lane (yes they are two lane roundabouts) - and you always get some numpty go straight over the roundabout cutting across both lanes.
The people who do this are of all ages/sexes and race - driving anything from a smart42 to a BMW/Audi/Volvo {XQVR}7 series, plus, of course, white van man in his silver van!