I usually only use it when I get close too, even with the dedicated portable GPS, which I don't need to carry anymore.
I can make it through the long haul, it's the last few turn by turns with the voice prompts that help. If you have a co-pilot the list of turn by turns is handy
I like MapQuest better than Maps because of the voice and options. Maps works ok though and I think it may use a little less data.
Take note, the voice nav and the ringer volume in MapQuest are set separate. Unless I missed something the only way to change the voice volume is to adjust the volume when it's speaking. If you hit the Volume when it's not speaking the speaker symbol says Ringer.