Communities built based on the assumption of cheap gasoline

A recently published Garrison Keillor editorial piece really articulated what I've been thinking about a lot lately. Upon the sale of my mom's house, I will soon be leaving Surburbia (aka BFE according to many of my friends), for "the big city" and the change couldn't come sooner. In the past months, I have grown weary of the big-box retailers, cookie-cutter McMansions, and chain restaurants that define the surburban landscape. I am fed up with a community laid out in such a way as to make cars the most practical form of transportation- lack of sidewalks and bike lanes, highways dividing neighborhoods, and buses that stop at 6:30 pm and don't run at all on weekends. I yearn for the kind of life that Garrison Keillor speaks of, the kind where neighbors get to know each other by passing each other while walking home from the bus stop, or biking to a concert at the lake nearby. A life unhindered by cars, where using an automobile for transportation is the exception, rather than the rule. So as I further my search for my own place, I have very specific criteria with regard to location relative to work, access to public transit and proximity to bike trails and entertainment. My only hope is that I can find something that satisfies these criteria without breaking my budget!