I'm in agreement with Anandita: If you've got to shop at a Whole Foods, this is the one. The only attitude I got was from a couple cougaresque velour-tracksuited shoppers, not from the staff (who were all refreshingly down-to-earth and friendly).
If you're straying from mainstream essentials, they are surprisingly price competitive (or even cheaper than) mass-market grocers. For "normal" food it's still Whole Foods and still often inordinately expensive. Their meat department usually makes me laugh.
But if you're looking for something weird enough even Sprouts doesn't carry it, chances are Whole Food not only has it but has an employee who can tell you all about it.