In any case, there are lot of cities in the US (and even more abroad) where you can get the walk-centric lifestyle without having to dodge human shit. Hell, even Manhattan, the city that supposedly defines urban grime, doesn't have this.
http://www.walkscore.com/TX/Austin
From experience, anything that isn't green on that map isn't anywhere near walkable, and only Guadalupe and South Congress have transit worth riding. 20-30 minute headways are the norm on other routes, and only transit devotees will put up with that, like I did when I lived on Burnet.
You are very correct that transportation is a lifestyle choice, but Austin doesn't make driving rarely an easy choice.
And since we're also talking about working for software companies, I would also like to posit – and I could certainly be wrong about this – that the majority of local software companies are not located centrally, where they are readily accessible via bus, rail, or bike. And once you're out of Central Austin, you're in a city that's built to car scale, not human scale.
As a longtime Austin resident, I'd almost consider that a nice problem to have, because it would mean that walking was an integrated part of my daily routine rather than something I have to explicitly make time for so that I don't lose my mind from all the driving I have to do.