In Netherlands you have to have a business trip reason (with paperwork of an existing company) that you need two passports. But this is doable, we used it on the last trip.
Then you get only a 2 year passport (where the regular is now 10 years).
It was useful with the Pakistan situation. But customs or embassy people look up strange when they realize you have two passports. It is not common for them, and you can get questions about it. I did not encounter real problems, but I would not switch around passports in no mans land if it is not necessary.
Or when entering Pakistan, I did not show the second passport, but the guy kept asking why the passport was only 2 years. I just kept saying "I don't know"
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