I have problems with daydreaming similar to what the article describes (it makes it incredibly difficult for me to work from home [with music the main trigger], though I am getting much better at controlling it), and yeah, most of it is wish fulfilment. Also fan fiction is basically wish fulfilment as well IMO, so that fits as well. (somewhat ironically, the effort to turn that into good fiction would probably fall prey to the same daydreaming problems)