Heroku's buildpack system greatly simplifies JVM application development by automating the build process and intelligently configuring environments for Java frameworks such as Spring Boot, Quarkus, and Micronaut. This eliminates the need for manual setup of deployment scripts and server configurations, allowing developers to focus on writing code. The article outlines how Heroku's Java buildpacks handle common tasks like database connections and runtime metrics collection, making it easier for developers to deploy complex applications.