[Turing_Machine]

'I'm Spanish and I think it has been months since I have heard "usted".'

This varies a lot between different Spanish-speaking countries. Heck, in Argentina they still use "vos".

[Maken]

But that's different, because in Argentina they have replaced the second person and "tú" by the third person and "vos". For them it's not a formal addressing at all.

However, I won't deny that for most Spanish-speakers Argentinians sound surprisingly polite.