In the intricate world of JavaScript, design patterns serve as a blueprint for solving recurring challenges in software design. But are these patterns inherently complex, or does their intricacy serve a purpose?

Let's delve into several of the more common patterns; examine the code used, why they exist, and what problems do they solve?

Furthermore, we'll broaden our horizon by investigating 'proto-patterns' and 'anti-patterns' -- the lesser-known cousins with their unique roles in the tapestry of JavaScript design.

The following patterns will be featured at the heart of our discussion:

* Constructor
* Module (Closure)
* Revealing Module
* Factory Method
* Prototype
* Singleton
* Observer

Through this session, we aim to unravel the complexity and showcase their pivotal role in crafting elegant and maintainable code.