If enough people comply, municipalities will spend less time collecting and processing leaves, which saves them money. See the video below that features Ann Holmes from the Greenburgh Nature Center in Westchester County.
Here are some things I'm trying with my leaves this year...
They're just being left on the floor of the wooded areas.
The leaves on the lawn are being mowed over and ground up, then collected to be worked into the vegetable beds.
What do you do with your leaves?