Nearly all suburban developments I've seen that were built within my lifetime have had plenty of sidewalks and signalled (sometimes even stoplighted!) crosswalks. The exceptions are old rural roads that became suddenly suburban when they got surrounded by housing developments, but the developments themselves always had plenty of sidewalks, and quite a few of the roads in my hometown of Elk Grove have sidewalks even when they didn't before (though sometimes with gaps, admittedly).

I've spent nearly all my life in (Northern) California and Nevada, though, so YMMV elsewhere.