I have to agree, this is a brilliant thread
I am somebody who absolutely loves the films, but, yes the lines can get intensely cheesy at times (I was absolutely shocked when they won Best Adapted Screenplay last year)
All of my favorites have been said, I too especially love many of Legolas' "Mr. Obvious" lines
I don't know if I can quote this exactly, but one that especially bothers me is when he says "the stars are veiled", and you can obviously see the stars clearly shining in the background
I don't really know if that is a cheesy line and not a movie mistake, but he is always stuck stating the obvious, and poor Gimli too, but, carry on