Wait, I though we wanted martials to feel important.
The real issue, I think, is that wasting abilities -- especially big abilities -- feels bad. The monster savibg feels like wasting the ability, moreover if the monster didn't save but then used LR to do so.
So what we really need is a design that both protects the players' sense of feeling effective, while also preserving the monster's awe and danger. It isn't an easy balance to reach. Ibthink it means looking not just at "boss" design, but going deeper and looking at how special abilities and spells work with regards to numbers of uses and saving throws.
One possible work around: if LR is invoked, the use of the spell or ability is not consumed.