I would argue that, while people can
redirect the stimulation from dopaminergics to get "motivated to [do] just about anything", the usual effects when the drug-user sets no specific goals are actually rather more specific.
Almost everyone who takes weaker amphetamines like Adderall ends up developing a cleaning compulsion; almost everyone who takes meth ends up developing a compulsion to pick at their own skin. The link I've seen suggested is that these are instinctual "foraging/grooming" behaviors, all using the same neural hardware related to finding small imperfections/differences in a scene.