Ansible? Compared to terraform, it should require less effort from the user, without having to worry about states. Compared to aws cloudformation or gcp cloud deployment manager, it should require less effort as well, without having to learn the different idiosyncrasies of these proprietary tools.

> It's just drivers for the cloud API in question

Exactly, and if you are on gcp, both the ansible modules and the terraform modules are even generated from one code base: https://github.com/GoogleCloudPlatform/magic-modules