I would love to see someone blowing leaves with a lawnmower haha! How long did that take?
The black plastic is not for composting, it literally just kills everything underneath it down to microorganism level if left long enough. It's a method used for killing weeds. Some people do it before starting a garden bed but honestly the best method is not to kill but to feed. Weeds occupy bare soil. They exist to fill certain niches in the biology of the soil. For example a lot of weeds are nitrogen fixing plants. If you have weeds in your yard it is because your soil is deficient in something.
As for composting, leaves are the easiest and cheapest material to build a lot of compost fast. If you don't plan on having a garden just chop them up where they fall. That's what would happen anyway if you weren't there. Nature knows what it is doing. If you plan on gardening, collect those suckers and make them benefit you. I'd go with the lawn mower bag method.
Ericdanielhughes
Student of landscape architecture