Very often yes I do.

Go encourages synchronous APIs, making it up to the caller to add concurrency. This is great, in my opinion. E.g. this is a common pattern:

  var wg sync.WaitGroup
  ch := make(chan int, len(items))
  for _, item := range items {
    item := item
    wg.Add(1)
    go func() {
      defer wg.Done()
      ch <- doSomething(item)
    }()
  }
  wg.Wait()
  close(ch)
  for res := range ch {
    …
  }

  foo, err := openFileOrSomething()
  defer foo.Close()
  [… do something …]
  err := foo.Close()