I had heard about dryer sheets too, so we tried them - they smell nice, we were hoping they would work. Last year - used dryer sheets, no issues.
This year - the mice were living inside my son's mattress, and had a nice little nest with babies in it made out of my dryer sheets on top of their entry hole. We had dryer sheets all over the house - and lots of evidence of mice.
We didn't do anything differently than the past few years....seems like luck of the draw... but I think dryer sheets are be too good to be true.