The only things that have really troubled me in the past (or would be convenient) would be
-All essences of luck (they are crafting materials after all)
-Mystic Forge Stones
- Blood Rubies
- +1 – +9 Agony Infusions
-Runes/Sigils (salvaging fills your inventory so fast with these, very annoying, even -though it isn’t a material)
-Petrified Wood
-Siege equipment
-Guild Banners
-Pile(s) of Elemental Essence (and other items similar to it)