I have 3 major grocery stores (Safeway, QFC, Target) within 15 minutes walking from me. And at least 20 bars and restaurants within the same distance. Public transportation to downtown takes about 35 minutes, which isn't great, but it's okay. Uber works well if you need to be faster.
Wedgewood, Fremont, Queen Anne & Freelard all successfully resisted the mass redevelopment that Ballard has seen, compared to 15 years ago Ballard looks completely different while the aforementioned neighborhoods have not seen that same level of mass demolition.
Depending on where you live and where you're going, crossing the locks is a great way to bike downtown. Also sometimes the Fremont bridge route is going to be shorter. I hate riding my bike over the Ballard bridge, but I'm not sure I'd call riding on it "risking death".
Bike access within Ballard is pretty great since the hills are a bit more manageable than in other parts of the city.
All that aside, it's pretty easy to live in Seattle and not have a car, being able to walk to groceries, bars, restaurants, parks, etc.
I would highly encourage avoiding the Ballard Bridge. IMO it's very dangerous.
Walkability in Ballard is pretty good. We're within 15 minutes walking distance of QFC and the bar/restaurant area south of Market. That said, I prefer to drive to the grocery store so I can go infrequently and buy more at once.
I really don't mind the short jaunt to the Fremont bridge, but it does add some extra travel time. Never ride on the Ballard bridge; it just doesn't have anywhere for bikes to be. The sidewalks are too narrow and unprotected from traffic, and the primary traffic lanes are going 40+ mph. That whole thing needs to be replaced for the 21st century, although there may be some resistance as it's a nationally registered "historic place."