OTOH, the constriction does persuade some of the speeding cyclists flitting down Valleyfield drive to slow down (e.g. me). It's a pedestrian route that has been made dual use, and as such it's a poor compromise. We're not paranoid, a lot of the things that we see as annoyances are deliberately placed specifically to slow/interrupt cyclists. It's the same reason that lights are phased to interrupt the traffic flow in towns, prevent build up of speed.
It's why I tend to stick to roads these days.