In NY near the Flatiron, I have several thousand lunch options within a 5-10 minute walk/subway ride. Of course I tend to return to the ones I've had good experiences with, but unlike suburbs I get my fill of novelty in many ways other than just the food I select from some megastripmall.
Urban centers also offer a much richer after-work culture of independent films, theater, music, and general night life that can't be found in the suburbs.
I would definitely make some exceptions to my statement for NYC and other similarly dense cities. However, lower density cities, liked DC or Austin don't really offer anywhere near the variety.
