The end of your talk goes into how to properly decouple your services from the container. Some developers may be doing this, some already decouple their services, while others may not know what you're talking about. I think your talk would benefit from showing an example of a tightly coupled service to the container, then how you progress through refactoring it out. It might take 10 minutes to walk through it, and why it's bad, but could really round out the talk.
I really like how you tied in your early experience with a computer to the modern complexity of software development. The segway into introducing SensioLabs Desktop was perfect.
Very good info about config validation.
The end of your talk goes into how to properly decouple your services from the container. Some developers may be doing this, some already decouple their services, while others may not know what you're talking about. I think your talk would benefit from showing an example of a tightly coupled service to the container, then how you progress through refactoring it out. It might take 10 minutes to walk through it, and why it's bad, but could really round out the talk.