We had a local IGA open in our estate recently. There are some things that are more expensive than Colesworth, but only by a small margin.
The same when a Foodworks opened where we used to live.
Being able to stroll to the supermarket is a nice luxury; it is quicker to walk to IGA than to drive to the nearest Coles or Woolworths.
I can go either way, however I do prefer self-serve if I am in a hurry and only have a few things. That said, the sluggishness of the Woolworths ones, and the Twenty Questions whenever I try to use them (and the inference from them that I am a thief) means that I will go to the service desk instead.
The friendliness of other Aldi customers is also refreshing. I have had other customers wave me through because i only have a couple of things; I usually buy a few Chupa Chups when I am checking out for those other customers, as a thankyou.
Safeway and Coles customers are typically more self-absorbed and militant about the queue.