Hello there,
With me, rather than having to "turn on the tastebuds" to taste, I have the ability to turn the tastebuds off when I don't wish to taste whatever I may be ingesting. The "trick" works fantastically when having to chomp down vitamins and other things I dislike but have to have, and it also served me well during college when having to fulfill the social convention of various shots of alcohol ... people were amazed at my ability not to shiver or screw my face up apparently.
But, I'm not certain I do this in the same way you "activate" as it were ... for me, all I do is close the hole[s] in the throat that lead to the nose when I swallow and keep them closed for however long I need to to not be able to taste. I am utterly certain that 100% of taste ceases when I do this, because I've tried it with many horrible things for fun ... weird eh?
Oh, and don't worry about "normal", it will serve you better 
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People always talk about how they 'lose their train of thought', with me, it's not the singular; my mind is greater comparable to Waterloo Station - with multiple trains coming and going at all times. It's as if I'm standing on a platform, alone, watching this chaos going on, picking out what I can from the residual matter left behind.