I was always against it and hate it still. The promise was that cars wouldn't be able to use it - only buses and cycles. Cars do use it. Also that it would massively improve the danger of the junction - it hasn't - just more roads to cross now. As a pedestrian, getting from the park to the costcutter side is still a nightmare, getting from the bookies side to the 2nd hand furniture shop side - also a nightmare. The lights still function as though the pedestrianised section is not pedestrianised (I guess to let bikes/emergency vehicles through) but as no other stream of traffic can see that happening it often causes confusion. The two right hand turn lanes coming down Dulwich Road into Norwood Road also often cause trouble as the middle lane can be right hand turn or straight ahead, so cars who want to go straight ahead often get stuck behind cars wanting to turn right.
FWIW I use it as a pedestrian, cyclist and driver and haven't seen any improvement on any front.