Uh, yes they will.
"I'm a mage! It would be cool if I could cast for less magicka! Let's enchant some items!"
Voila.
"I'm a mage! It would be cool if I could cast for less magicka! Let's enchant some items!"
Voila.
You mean let me dedicate 6 hours a day for the next week to leveling in enchanting and smithing only, with the specific intent of creating uber Mage equipment? Right, thought so.
Sorry, failure.