I don't do the "tap", I reach in my pocket and see if I forgot anything. Probably shouldn't do that in public, though if I ever realize that I'm doing that in public and someone might be looking, I'll pull out my keys as if I meant to be reaching in my pocket to pull out the keys.
Though no matter what, I'll always have that "did I forget something" feeling, even if I'm literally waiting to go somewhere and have all the time beforehand to get stuff.
That's why I sometimes do the "if I go with nothing, will I be fine" game. If answer is no, I'll work my way backwards from there and make sure I got whatever I need before leaving.

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