[dbattaglia]

I think the language and framework are also important in deciding to use them or now. In modern C# with MVC/WebAPI it feels wrong to me to NOT use async/await/Task (the .Net version of Futures and Promises). For fairly little change in coding style you can get some big performance wins on IO code.

[obstinate]

Unless you're writing pretty perf intensive code, part of me doubts you're going to see huge wins on something like async/await.