[noirscape]

I agree with you; I think it's because of 2 things.

1. De Heer der Ringen sounds very formal. It's because of both the choice of "Heer", which is a literal translation of Lord but is more commonly used to describe an old, respectable man. (The connecting word of "der" only adds to it, given "der" isn't often used nowadays.)

2. "In de ban van X" also nicely doubles as a Dutch saying; being in de ban of something means being enthralled by it. Which fits well with the overall motive of temptations that the ring provokes in those around it.