I like street view when I'm sitting home at my computer, but I rarely use it on my phone. What I do use when mobile are transit features and walking directions. I try to drive as little as possible. I was disappointed that bike directions were not available on the ios google map, but I could usually figure something out.
I've used a lot of regional transit apps, but once google had the transit thing integrated, I pretty much abandoned them. Earlier this year I was in NY, and got around faster and easier than ever before thanks to the google map on my iPhone.
About a year ago, I was in Moline, IL, and although I typically drive there, one day I decided to try out the public transit. At the time I was still using a Palm Pre (I won't get started on that right now), and while I was out that day, I got a message that my maps app had an upgrade available. So I downloaded it, and guess what... the upgrade was a Bing map. Which didn't have transit directions! I tried to get go to google maps on the browser, but it wouldn't let me... It kept taking me to the Bing map... this was after HP had taken over, but before they shut it down. So, that was the last straw for me. As soon as I got home, I got an iPhone. Two things about this:
Don't take features away.
Don't make me use your thing if I like somebody elses thing better than yours. Make your thing better than theirs, then I'll use it.