Hola
Is "por favor " considered necessary all the time?
With every request?
Quisiera una taza de tae (por favor!)
Muchas gracias
No - the Spanish think that English speakers overuse the word please. I’ve had one person tell me it sounds like they’re begging all the time 
In normal ordering of food or drinks, for example, you rarely hear anyone say por favor. As long as it’s done with a polite tone of voice, that’s enough.
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Gracias.
So is "Gracias " used regularly then?
Gracias 
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Sí, gracias is very common 
De nada
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