I like the way that people decide that instead of just sticking to lane two, they can now stick to lane three, so when you have to catch up with them in the wee small hours of the morning you get to change lanes from one to four to overtake them...
But the only real issue I have with them is that the motorway matrix sign setters get to lie even more... I remember finishing a night shift in London and coming back down the M3, and once passing the M25 the matrix signs had me driving in lane 3 (of four) and 40mph... with all four lanes empty and clear from the M25 to Junction 4 (where I turned off).
Or when you see them slow the traffic down for a "queue", but you can see the next gantry has a speed restiriction, but the one after that is back to national speed limit... and there is no queuing traffic between you and the third gantry...