no... everything's on the downfall ever since the creation of the microchip The human brain is, and will be far more evolved in comparisson to the fastest computer on earth... eventually the computer will be catching up to our thinking speed, but still random choices, and intuition, to the fullest intent of this word, will be untouchable by such a machine. We might be able to train our brains to accomplish something with the same speed as with a computer, but a computer will most likely never be able to create something on its own, personal endeavour.
They are useful since they do the things we don't have patience to do, but they are bad because of the fact that they force us into some sort of illusion of having limits... those limits belong to the machines you're using, while your minds still know no such boundaries.(of course unless you're mentally challanged and by that, I do not intend to offend such people, if they are amongst us. )
Long-term, short-term... just the same. I can find both positive and negative aspects of using a computer for both timespans.