You started your post by claiming it wasn't true, but you proceeded to say that yes, it is in fact true.

As it is stated in the screencast, a programmer needs to add the workspace to $GOPATH to be able to build the source. That means that for each project being developed in Go, you need to add the path to that project to $GOPATH to be able to build it.

That is a very poor way to do develop software.