The Temporal Cookbook on TC39's site provides examples of how using the new API looks/feels:

https://tc39.es/proposal-temporal/docs/cookbook.html

For example, calc days until a future date: https://tc39.es/proposal-temporal/docs/cookbook.html#how-man...

...or, compare meeting times across timezones: https://tc39.es/proposal-temporal/docs/cookbook.html#book-a-...