You mean like Go does with channels? (Not sure how good their visibility is to the debugger though.)
Go has a couple of deviations; channels aren't queues unless you are careful to size them > the number of things you'll ever put in them (else the thing trying to put something on a channel deadlocks; you can of course timeout on it, but it presents tight coupling in that case, the goroutine sending has to care about the state of the thing receiving), goroutines aren't dedicated to channels (that is, there is an m-n relationship between channels and goroutines which can lead to a lot of incidental complexity), and, you can see what is on a channel if you have a breakpoint, but that assumes you can get the code to break inside of something containing a reference to the channel.