Yep, LLBLGen generates all the plumbing so you don't worry about mapping, transactions, serialization, change tracking, etc. So you can focus on the business logic.
Also LLBLGen has a powerful template system. This means you can generate whatever you want/need from the LLBLGen metadata. There are people generating custom GUI projects, Manager classes (like standard business logic), custom classes to decorate MVC, etc.