I'm skeptical of your 10x less code claim. You can definitely get into broken state problems in CloudFormation - with no recourse but to blow it all away and start over. And despite being a native tool, CloudFormation support for new features and services in AWS is often spotty/missing.

That said, my experience has been that both CloudFormation and Terraform are irritating, just in different ways; they both are warty.

I do ultimately prefer Terraform - even in a single-cloud setup.