Takes some folks quite a while to sort through the confusion and adapt to change. I still see cars nosed in to the back-in designed parking on Detroit across from the Rusty Crane.
True, and that's one reason for the recommendation to paint the bike lanes green. It's more expensive, but can make a new, unfamiliar, possibly confusing roadway condition more understandable to drivers.
I've seen vehicles parked head-in on spaces clearly marked as back-in, and I've seen cars backed in to parking spaces clearly marked as head-in. In Tulsa, the angled parking is willy-nilly, and it's very confusing to some people, because it often involves drivers making illegal U-turns, crossing the centerline of two-way streets, and similar unsafe maneuvers.