I have been riding to work for about 10 years and have also noticed a large increase in the number of cyclists in the last year. The congestion is also spreading to the bicycle tracks. Cyclists need to remain far more alert especially if you add pedestrians, dog owners and dogs (on leads or running free), rowing crew coaches, motorised scooters etc. who may not have their minds on other potential path users.
Over the years I have been knocked off or nearly off my bike by some of the above.
It just all adds to the call for better cycling facilities.