Does wolf urine actually smell strong enough for humans to detect it? I would have expected it to smell as much as dog urine, which isn't readily apparent (while you can see it during winter, you can also see the paw prints...).
As far as I understand, wolves have large territories, so they may well be 10 kilometers or more away from you even if you're inside their territory. New packs form from time to time, and they try to set up their own territories, preferably without getting into any fights with established packs. Killing off a pack will leave its old territory open for claim by new or established packs, so there is a dynamism involved. In addition to this, young, typically male, wolves are expelled from their flocks to roam as solitary wolves looking for a mate to start a new pack with, and these wolves tend to roam far and wide.