If I may...
Durability : I hate it, but... I'd find it less a waste of game time if it were only tied to crits ; for example, crits might damage armor/weapons/shields (why not even wands and other magical artifacts), and it could be required to perform something specific to "repair" them (I mean a "special" repair, not something any adventurer could do).
Crafting non-magical weapons/shields/armors : I hate it, but... I'd find it less a waste of time if it were something specific to a class / subclass which does not have access to magical items.
Crafting items : why not, as long as it allows to craft non-magical-but-class-specific items (e.g. craft traps for characters who can use them, scrolls for mages, potions for clerics etc.) ; but I'd hate that an all-powerfull crafter could craft anything craftable (is this a word? English is not my mother tongue sorry...).
Crafting magical weapons/armors/shields : very very rarely please ! and not without the need for a dragon encounter to provide the correct temperature, or a similar should-i-really-ask-him situations where the output is all but certain.
I do not enjoy crafting, and I quite honestly do not enjoy looting any more, as I've seen too much game where those were used as a bad simulation of reality, rather than a true immersive gameplay feature. But when I find a game where it's done the "roleplay" way, I like it... So please, please do not make it a rythm killer.
By the way. As said earlier on this thread, just go mad with the food! Books with lunatic recipies are always my favorite in a dungeon!