I check map apps for my best commute option a lot. My gripe is that for each leg of my commute, there are about 3 or 4 options, and I know how to drive all of them, but turn-by-turn insists on explaining it. What I want is a summary when I head out, and possibly an update at decision points. I just have no idea how to make an app (or an interface) for that.
I think turning off voice navigation will help. You simply drive each leg on your own and glance at the navigation screen at the decision points.
I've turned off voice navigation altogether. It's just not necessary in most cases. Just take a minute or two before departure to actually read the map and the route, if you are not pressed for time. It also gives you much better spatial awareness of where you are going and how you are going there.