Yeah they are all crutches. I feel bad that I can't add three-digit numbers in my head when my grandparents could do it easily.

When I was in high school I remembered all my friends' phone numbers. Now I don't know anyone's number.

I don't think it augments our computational units, it atrophies them and we become ever more dependent on the tools. Yes, the tools can also do things beyond (or faster than) what the best human mind can do -- but at a cost.