I'd like a language that, as much as possible, insulated me from async worries. I'm thinking of how garbage collection helps me forget about memory allocations. I don't want to have to pepper my code with 'async' and 'await' hints everywhere. I'd prefer to not have to figure out the syntax incantation for marshaling data across threads. If I'm not mistaken Go is the closest to this?
In my experience, Elixir (I haven't used Erlang much, so can't comment on that too) is the first language that removed async concerns. With the lightweight thread approach and message passing, things can get "embarrassingly parallel" very easily.