I recently hit 80 (now 81) on my disc priest which I did LFD/LFG all the way from 15-80 with minimal quests in between. I was Disc spec since level 10 and haven't looked back.
Pre-Cataclysm dungeons, I basically dps'd, bubbled and randomly threw out heals (since dps'ing heals as well with talents). Which was fun and pretty easy (sadly I was usually #2-3 on the dps meter).
I ran my first Cataclysm dungeon yesterday, Throne of Tides, and I noticed that it's much more healing intensive. My gear is mostly Deathsilk and random quest gear from Cataclysm... but trinkets/neck are from Halls of Lightning or worse.
Is this a big change in Cataclysm? Are healers (such as Disc) no longer supposed to smite heal as much as they did in vanilla/bc/wrath?