I am thankful for a dishwasher. I absolutely hate washing dishes. It is a never ending chore with which I feel I can never get ahead. The kids always eat, so there are always dishes to clean. So I absolutely LOVE having a dishwasher. I've lived without one before and it wasn't pretty. Having one now is such a blessing.
An even greater luxury is having kids who put the dishes away. One less chore for me to do!! (Though sometimes getting them to actually do the chore is a chore in itself.)