I never have, I think it makes that spell stronger than it already is for those trying to hide their alignments (assassins and the like). Also, the spells required for creating aligned weapons are not divination. All of them are evocation.
Tarantula is correct those arent divinations, also in the APG is a spell to reduce the damage taken due to alignment based effects so i would say look into that if you are trying to get around damage from those effects giving you away.
Yes, I'm aware of corruption resistance, which seems a bit underpowered compared to resist energy, to the tune of half as effective. Also, it's an abjuration, just like resist energy. All of this, however, discounts the fact that corruption resistance is a newer spell, and didn't exist when I was running my 3.5 game. I still like undetectable alignment as a damage resistance-type spell, as well as the vanilla "I'm chaotic evil but you can't tell" use.
Its your game, its not RAW as those alignment effects are NOT divination, but whatever floats your boat.
I have always ruled that it blocked the extra "to-hit" portion of the aligned weapon, but not the extra damage, as once the weapon is acutally in the creature, it knows that it is in an "enemy".