Took a walk around the neighbourhood the other day. We live pretty much inbetween two "plazas". One is Northpark plaza which offers a supermarkets, some restaurants and shops and on the other side of the complex we have Orchard Hills, with supermarkets, some nice restaurants - including our all time favourite La Sirena - banks, and shops. Takes us about 10 minutes to walk to either one of them so we have a quite a decent spot. Even if Irvine can be annoying in the way that it is spread out, has no downtown or city centre, it does have the advantage of being a planned city. Wherever you live, you can most definitely walk to a supermarket or bank, and most likely also some restaurants.
Some pics of the neighbourhood, enjoy!