I think all of these replies so far capture my thinking. However, I think the simplicity of the GCP IAM model is what I will miss most going back to AWS.

I’m sure they exist, but over the last dozen or so years I’ve worked with public cloud offerings across 5 or 6 industries and domains, I haven’t found a use case that can’t be easily implemented in the simpler GCP model.

AWS support is really nice. That I miss.