The biggest cultural difference DevOps brings is pulling together different roles/people into a specific team with the same delivery goal.
People get to do what they are good at and get instant feedback. DevOps enables quick solutions in the case of a technical glitch and contributes to team health, individual satisfaction, and time efficiency and management.
For example, a process that used to take months is now executed in minutes. It turns environment provisioning from a new problem into a delight, at the press of a button.
DevOps has given us the facility and flexibility to invent and focus on actual business needs, instead of managing hours and weeks and months of operational tasks.
Sites such as Amazon, Facebook, ...