Copilot Pages - collecting, sharing and collaborating with Copilot responses. I have even found Pages convenient to use on my own. Using the results in Loop pages to create and solve problems.
The experience building out relational database schemas in Dataverse with the ability to generate rows of sample data and make further Copilot driven adjustments.
That, and how amazing Graph Connectors now work with declarative agents for extending Microsoft 365 Copilot ✈️ 🚀