I'm not dying, but I am able to do the same small-talk with the folks in the Kroger. It's just familiarity from going there often. Some of the employees were players on basketball teams that I have coached. That was back when they were in 3rd grade.
The folks in produce and in the meat department are not going to be manning the cash registers, but one can ask them about anything and they will do special things for you just like at a stand-alone butcher or produce market.
I get amazing service regularly. Here are a couple of examples:
"Sir, I'll open this register for you, are you ready?" and then when someone got in line after me (maybe it was you?) "Sorry, this lane will be closed as soon as I'm done with this customer."
-or-
"We have a special on king crab legs today. Would you like to try some that I've just cooked?" "I'm not fond of crab legs, but my son loves them." So my son eats a pound or two of cooked crab legs.
-or-
I can send my kid over to get something. "Go ask Betty in the meat department for ... she'll know exactly what I am looking for."
Employees are not evil and they like to be treated with respect. It's amazing what they will do for you even in a big box store or national chain. There is no Costco nor BJs close enough to me, so I cannot comment on those establishments, but the Home Depot folks are amazing to me whenever I go. I don't bother searching for anything anymore, but just ask as I walk in. I get great tips on fixing things, too. And they have special-ordered plants for me, too.