Other routes are there:
When you have searched for a destination, click on the bottom right where it shows the commute type (car, bus, bicycle, walking) and estimated time. From there you'll find a list of three suggested routes (at least I do). When clicking on any of the the suggested routes, it'll show all of them in the map and you can also choose a route by clicking on it in the map.
Additionally, I get back from navigation to route view just by pressing the back button. Works just like it should?
Just tried it and it is like you say, thanks. Influenced by the previous version, I thought pressing back button would exit navigation.
Then one more complain: in the previous version I could get a metric scale from the labs, which I think is not there anymore. I think a map without a scale is a toy-map.
All that is still the move toward less and less control for the user, initiated by Apple. I hope Google can revert soon, now that it is actually Apple which is coping with Google.