While I have only gotten to hold one knife with with filework, a 532 I got a real deal on, I like it. I have looked at many pictures and seen a lot of knives it really looked good on. The right amount, not too much and it really says it's not just an ordinary knife and has an elegance to it that sets it apart.
On the lock spring or tang and on the spine.
I agree too much gets gaudy.
I can visualize a titanium bolsterd 112 slimmed down with a drop point blade and a nice pattern of filework.