I serve on the Planning Board in my small New England town. We've looked at some of these same measures, but many of them are eliminated because they make it more difficult for snow plowing. Anything involving raised crosswalks or bump-outs gets push-back from the DPW. Paint gets mostly sanded off every winter.
Separated bike lanes ("cycletracks" is the buzzword here) are great. The problem is our roads are too narrow and old, so even if we have the money to put them in, there simply isn't enough space without using eminent domain to take land for widening. That doesn't go over very well.
It's great that they can do these things in San Diego. It's unfortunate that we can't do all the same things here. Every location needs to find solutions to improve safety that work in that location.