Half a quart of fuel added to 5 quarts of oil isn't going to result in anything good in the long run. A dilution ratio that high is going to reduce the viscosity significantly and caused more wear, not only from the large reduction in the oil viscosity, but also from effects of fuel (a solvent) on the oil ad pack.
I could see 2 to 3% as "normal" and not have any real long term ramifications, but 10%+ fuel dilution in the sump most of the time certainly isn't going to be a good thing for engine wear in the long run.
A lot of this is short trips and some are extreme like a mom starting up the car to drive two blocks to the school bus stop. Many times idling waiting for the bus. Or, driving to the neighborhood mailbox cluster or driving a couple of blocks to the convenience store.