Yes, you, I and, to judge from forum posts, 99% of other Word users turn the automatic language detection off because of the annoyance it causes during normal text editing.

That makes it doubly annoying that the functionality cannot be accessed for one of the few circumstances in it would be genuinely useful! I have a large document with alternating German and Polish sentences, and I need to hide the Polish parts (so that they are ignored by translation software). So it seems that the only way to do this is to manually identify and mark each Polish sentence even though, theoretically, Word has the functionality to detect language!