I am not one to argue that you should only visit countries of which you speak the language. If I was, I wouldn’t have made it to 65 countries or so myself.
But speaking the language does increase the experience.
If I hadn’t known some Spanish, I would have been completely dumbfounded by this English translation at the bus terminal in Baza, Andalusia, for example.
Even the Spanish original has a typo.
Still, it was a lovely old-fashioned bus terminal, where the answer to everything from “Is there a bus to Orce today?”, “Can I buy a ticket here?” to “Is this the right bus to Orce?” is an optimistic, yet non-committal “I think so.”