Guided meditations, I have found, are excellent in helping a person do things that they may have not been able to on their own. As an example, I have done a couple of guided meditations and learned through these how to contact my guides on my own and henceforth, have meditated on my own.
i dont beleive that there are 'spirits' out there just hanging around waiting for us to become enlightened on our journeys so in that I think perhaps that person is probably more right! But sure, a guided meditation can have many benefits.. :)