Costco, looking for suggestions

Well, folks. I must be one of the rare hold-outs in America. I don't belong to a warehouse club. I know, I know. It's a shocker.

We don't have a Sam's Club where I live (so it's not an option). As far as I know, all we have around here for a big-box store, is Costco.

All of you Costco lovers out there, who love a good deal, please let me know. Is it worth the fee for the privilege of shopping there? More importantly, what do you shop for? What are the biggest savings??

I have read a few articles on the subject (Consumer Reports, Good Housekeeping), and they say Advil, prescriptions, paper goods, etc are good buys. But they took ONE item and price matched it across a few stores. They showed direct comparisons for only 6 items (which isn't how I shop, what if I don't need Vanity Napkins? Sure, it's a good deal, but I don't use that!). Frustrating.

I am appealing to you, the regular consumer. What things do you find to be the best deals at Costco?