Whole Foods is a good choice for better quality food than a run of the mill grocery store. However, in most urban areas, the big name grocery chains are carrying organic and healthy food choices, too (they want in on the money train, of course, as people wise-up and realize they are eating garbage) so I frequent them but buy organic.
However, Whole Foods and the healthier stores are not near everyone. In that case, one can only do the best they can with what they have (unless they want to grow their own organic food from seed, of course).
I mean, if traditional food sold in the likes of Safeway and Food Maxx are actually BANNED in Europe because of health concerns, then that's a real red flag that people should be paying more attention to what they're putting into their bodies when they're in the United States, where those very unhealthy choices are allowed - but shouldn't be. So, to answer your question, if my regular supermarkets didn't have good choices and Whole Foods was the only game in town, I would be shopping there.