(Disclaimer - it's a /very/ long time since I motorcycled in London)
Speaking as a motorcyclist & cyclist (& pedestrian & car driver) I don't consider that I have a right, when riding my motorbike, to travel faster than other motor vehicles. If I can accelerate away, or filter safely, then fine, bit after all I'm just another motor vehicle user on the highway.
There's no magic formula associated with motor biking that means you must get to the front of every queue, sometimes you are left sucking exhaust gasses, and admiring the view.
If the wide strips encourage more bicyclists then excellent!
And maybe this ought To be in "Vroom "