I was actually just thinking about that last night. As I was questing through Moria, I had the interface turned off so that I could fully immerse myself without distractions. The game truly is beautiful in many areas without the UI in the way. I also enjoyed the challenge of not having the radar. However, I had to turn it back on every time I had to talk to someone, which was kind of a bummer. You also can't turn it off during cinematics like the watcher attack when you're first going into Moria (which totally ruins screenshots imo).
Belegwen - Silverlode/Gladden
Silivren - Meneldor/Gladden
Elistriell - Vilya/Gladden/Anor