I like playing with two staves. I know I don't get the extra weapon and spell damage I'd get from duel wielding, or even the extra enchant from a sword and board. Over the past few years I've learned that I'm awful at fighting close up, but can whoop up with a staff with the best of them. That said, I've recently moved from destro-resto to resto-resto and LOVE IT.
First off making them have different enchants is obvious. My DPS bar has the +348 for 5 seconds weapon/spell damage enchant and my heal bar has a self heal enchant. What this means is that I can basically hold heavy attack constantly and either be buffing my next spell, or healing myself instead of just swinging at air with my sword. Also each heavy attack gets me 30% more magic back than my destro staff did.
Put them together and my DPS bar still has 40k magic and, when buffed, just north of 3k spell damage. For reference this means the tool tip on my Breath of Life is above 11k and ice comet is still above 17k.
Anyway, it's a fun way to play. About the only person who could kill me last night was Emperor Iloverainbows. Thought I'd share with the crowd.
TLDR: Resto-Resto actually works great in Cyrodiil.