Agree Docusaurus might be overkill for simple docs, however we also made sure the experience for simple usage is great.
It comes with file-system routing convention, versioning, accessibility, internationalization, good SEO by default and many useful features that would take time to build in userland...
We have many devs using Docusaurus as a portfolio or personal blog, we even have a dedicated showcase tag for that: https://docusaurus.io/showcase?tags=personal
For advanced needs, like multi-sdk support, we get you covered.
Site with multiple frontend SDKs (React, Angular...): https://docs.dyte.io/react-ui-kit
Palo Alto Networks has a dev portal with multiple products using Docusaurus, all sharing similarities but with tweaks per product: - https://xsoar.pan.dev/ - https://prisma.pan.dev/