[gavinlit]

I think the key word is 'just'. Sure if someone learns maths just by using a calculator they won't have any of the basic principles. Just as someone who learns to write via spell and grammar check will miss out. However, the use of calculators is not, in itself. some kind of mathematical evil that causes people to lose mathematical understanding. It's just a tool. It can be used wisely or not so. However it won't empty anyones head all by itself.