As to öre (at least in the Swedish context; I imagine the same is true in Denmark, Norway and the Faeroes, but not Iceland), it depends on how you define 'use'. The öre is alive and well in Sweden, it's just that there are no coins carrying öre denominations any more. Prices are given to the nearest öre when you buy by weight or volume (e.g. fruit and veg in a shop, or petrol etc.) and you pay the precise amount if you pay by card or electronic bank transfer. Electricity prices are generally quoted in öre/kWh. Crucially, perhaps, people refer to the fractions of kronor on bills as öre, not as a decimal fraction of a krona. So 10,75 kr would be spoken as 'tio kronor och sjuttiofem öre' not 'tio comma sjuttiofem kronor'.
The Nordic exception is Iceland, where the króna is worth significantly less than its mainland cousins. There by law all invoices must be presented in whole krónur, and there are no aurar in use electronically or otherwise.