This is why Deno is a dead-end. We have tons of excellent solutions in the Node-verse, and they need to build everything up from scratch (or create ports that are "unstable and shouldn't be used in production" [1]).
And it's not just the ORM that's interesting. It's the tooling that will connect, say, TypeORM or Prisma.io to GraphQL, so that you can throw up an API in a few lines of code, that means you're writing something like 1/100 the number of lines of code for equivalent or even superior functionality.
The one thing that keeps bringing me back to ActiveRecord and ORMs like it is the Relation class. Being able to pass around and merge queries is great for organizing code and keeping concerns separate. For example, implementing pagination, user permissions, UI filtering, and tenant segmentation, all in the same query without these concerns depending on each other. Composable scopes on models is another joy.
One convenient trick with Postgres is to define complex calculations as SQL views. Define an ActiveRecord model for the view, point some “summary” associations at it, and read it like a table.