You all claim that motorway driving is a simple affair and anyone should be able to do it yet complain about others poor driving habits.
There's a lot of people out there with the belief that doing 70mph entitles them to sit in any lane they wish.
There's also the issue of lane changing. Just because there's a gap large enough for your car it doesn't mean you should just jump in it. It's the morons causing other drivers to brake that causes the majority of these tailbacks on motorways.
Educating people about their actions and the effect is has on the flow of traffic might help prevent some of these accidents that are all too common in rush hour congestion.