I use AWS Organizations to manage multiple accounts. It is similar to SSO. The main difference is that I use JamCloud for sign-in. AWS Organizations acts like a parent account with multiple child accounts to manage billing, access, and security features.
The main feature of AWS Organizations that I find valuable is the management of multiple accounts. I can manage billing, access, and security for all accounts from a single point instead of managing them separately. It provides a single pane of glass for oversight.
Additionally, its consolidated billing feature streamlines customer financial workflows. Since it is a free service, it is cost-effective for managing multiple accounts.