Believe it or not I'm feeling so much better now after reading other pet peeves!
And it did remind me of others that I didn't encounter today at Costco.
I agree that the cashier should say "hi" and "thank you", at the very least. When a cashier doesn't, I still say "have a nice day" before I leave, which humors me because many times after I say that they STILL don't have a clue. But it leaves me snickering at least (yes, I'm a cheap date).
I also don't like it when it's my turn to check out and the cashier is still chatting with the person in front of me. It makes it hard for me to even ask for paper bags, etc when I can't get a word in. I feel like I'm interrupting them.
I rarely shop at Wal-Mart, but when I do it's true that people seem to hold family reunions there. I was there with my son recently and we couldn't believe the l-a-r-g-e families, talking, blocking the aisle, etc. Guess it's not just our Wal-Mart.
And I also do not want someone standing over me when I'm scanning my credit card. I can literally feel them breathing down my neck.
Our Safeway is the store that has the workers of all kinds greet the customers. It may have started for a good reason, but it does get so fake. And c'mom, Petsmart, when I'm buying dog food does the cashier, each and everytime really need to ask me what kind of dog I have??? Next time I'm going to walk up and announce, "I have 2 mutts" just to get it over with.

You don't give a rat's behind about what kind of dog I have (only care that I am actually buying my food there as opposed to Petco), so quit making the cashiers ask!
When I buy the kitten's food at our local pet store, they talk and are friendly, but I can tell that it's genuine and it is nice.
You know, a lot of these things, such as blocking an aisle, out of control children, etc, wouldn't even be an issue of people would simply say, "excuse me" or "I'm sorry". It's doing these things and acting as if you are more important than everyone else that really irks me. There's been plenty of times that a person has cut in front of me, but then realized it and said, "sorry" and I am so forgiving. Makes such a difference!