Just need to ride through Leith Links to see how awful road narrowings are.
Leith Links is a perfect demonstration of half-baked council thinking. It has wide buildouts, with cyclist cut-throughs, with car parking immediately on either side of the cut-throughs meaning they are permanently blocked.
Ridiculous, but at least some jobsworth got to tick the "building facilities for pesky cyclists" box on the form when they designed* the layout.
* I'm assuming it was designed. Or perhaps they just gave the chimps at the zoo some lego bricks and asked them to come up with the arrangement of buildouts.
My personal pet-hate narrowing is Murieston Crescent, which is part of the Roseburn - Russell Road - Dalry Road rat run. If you are coming from the path from Telfer Subway and want to turn right off Dalry Road into Murieston towards Russell Road, you find oncoming traffic in the middle of the road thanks to the buildouts.
Going in the opposite direction, it completely blocks any filtering (in conjunction with parked cars and the communal bins and the lorry-proof bollards). In the evening there's usually a queue half way back to the railway bridge and it's quickest and safest to hop off the bike, push up the pavement and back onto Gorgie Road.