No enchants exist that actually raise your destruction damage, only reduce magicka cost. Smithing, as far as I know, doesn't benefit magic damage in any way either. Only alchemy provides any bonus to destruction damage, and even that is tedious because of the sheer amount of potions you'd have to make to have enough for every single battle. On the other hand, enchanting, smithing, and alchemy all give damage bonuses to melee and archery.
So basically, if you include all three crafting trees, destructions gets 1/3 the benefit the other playstyles do.