Thanks for the share, didn't heard about it before, I see the advantage in a use-case that we have :

We have are actually working on : "How to manage Terraform resources". We ended up having a conflict dev <-> ops where dev teams are messaging the terraform guys to create resources. For example, to create a database, it will take only 1 hour writing HCL, but 2 weeks of emails to align on the specs.

We are currently building something on top, to have resources that can be created in a self-service mode by the devs themselves. (Behind the scenes, it uses Terraform modules to generate resources that will comply with the company policies).

For the moment, it's a bunch of Jenkins pipelines. Having a CDK can actually help us a lot there. (Can plug it to a CMDB database, have a UI on top, etc)