I'm only a Rust noob, and have importantly only used it for my own hobby projects. But can't you get a lot of the ergonomics from memory managed languages by using "managed" container structures like ARC and being slightly sloppy with your allocations?
For my hobby projects it hasen't felt more cumbersome than e.g C#.
Arc is not a convenience, since the type matters, the type is visible most places, almost no trait impls transparently work the same on T and Arc T and so on. For all its strengths, it must be said that it's not a language of transparent convenience, not when it comes to this central issue of ownership and sharing.
For my hobby projects it hasen't felt more cumbersome than e.g C#.