I doubt Apple employees are as productive as everyone thinks they are. Isn't there some statistic that on average 38% of the workday is wasted by employees. Do Apple employees really need these restaurants and perks, on top of their already comfy salaries? How many people work at this company? How many people does it take to get a simple task done? How many product launches do we get a year?
You can see the number of Apple employees at the company profile on finance sites like finance.yahoo.com.
If you calculate revenue per employee and compare it with that of their competitors, you will find that Apple employees are very productive vis-a-vis their competitors. Note that a large percentage of Apple employees are in retail sales. The engineering staff is actually quite small for a high-tech company of their size.
Note that Apple's food service outlets are partially subsidized by company and aren't 100% free like Google's. Apple employees still need to shell out some money. This is pretty typical for Silicon Valley companies, whether you're at Facebook, Yahoo, HP, Oracle, Cisco, Adobe, etc.
The main point here is that while Apple has similar food service facilities scattered throughout their various Cupertino campuses, they really need another secure cafeteria for the folks on the west side of De Anza Boulevard because of the large concentration of Apple office buildings in that area (I think the gym is somewhere around there).
Otherwise, people end up driving to SK Noodle, Bombay Oven, Panda Express, whatever and none of those places are suitable for company confidential discussions like a secure company cafeteria (like at 1 Infinite Loop). So people end up casually/socially chatting rather than discussing work.
The same with the article's comment about another facility being created at Results Way. Right now, a lot of Bubb Road Apple employees are walking along the old Southern Pacific railroad tracks to Gumba's, iSushi (yes, really), Vivi's, etc.