Thing is, in order to have pervasive reuse of data structures (mitigating the overhead of GC) while maintaining safety and correctness, you have to track uniqueness and mutability throughout the program. At that point, you've got something that's practically indistinguishable from borrowck.

The real use case for GC is managing data where there's no well-defined "ownership" pattern, such as when dealing with general graphs (e.g. in a symbolic computing or GOFAI application). That's a remarkably niche domain.