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As far as I know, we use the continuous form (be drinking) when we're irritated or frustated about something that happens on a regular basis.
When we say "Horatio is drinking so much whiskey before work" we express our anger, our irritation about it.
But, conversely, when we say "Horatio drinks so much whiskey before work" we merely state a fact, without any emotional involvement. We don't judge it.
Having thougt about this, I think with the first piece of advice ("Horatio should not be drinking so much..."), we express our anger while giving the advice.
Whereas in the second sentence, we simply give advice without feeling angry or irritated about Horatio's drinking wiskey before work.
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