I'm the opposite...i'm leaning more towards holy right now.
Since I got better gear, spirit isn't nearly as much of an issue so I can last through an entire fight as holy now.
I like holy for fights where I am expected to top people off quick, especially 2 healing. Holy feels "safer" on these high damage/aoe fights.
I feel this way too, having been Disc all MoP and just went holy two weeks ago.
After a bit of adjusting, I *feel* holy is much more capable a spec. Let me give some examples (from a 10m perspective):
Megera - With our healing comp (Hpally/rdruid or rshammy) rampages are a joke. But the spread aoe healing late in the poison explosion phase, disc lacks the raw healing output to keep the raid up. Once you've used PW:S and WS is on your targets, and cascade is on CD, you have no way to move those health bars back up. As holy, you have many more options. Specc'd into DI, and rolling PoH/CoH on groups while in Sanc, you can provide HUGE sustained HPS and completely stabilize the raid. Not to mention lightwell should somebody get low.
Dark Animus - Holy really pulls ahead in the final phase of the fight, when Dark Animus starts to AOE near the end of the fight. Matter swaps are still going out, and again, sustained AOE is needed. Same strat as Megeara... PoM, CoH, PoH for keeping the raid topped off. Lightwell (glyphed) is also amazing in getting matter swapped players up fast.
Iron Qon - When soaking the fire debuffs, and 3 people are taking large amounts of damage, Disc has a hard time keeping people up. Offensive penance may or may not hit your group / defensive penance doesn't hit hard enough. PWS takes 3 globals and gets eaten through too quickly, leaving you with 3 targets with weaklend soul. All your direct heals hit for 25% less than holy in serenity. Grace is impossible to stack on 3 targets at once. Holy is infinitely better. Sit in serenity chakra, renew the 3 people who are stacking, and binding heal away. You'll refresh your fantastic renew on you AND your target. BH x 2, leaves EoL, fully stacks serendpity that allows a very strong/cheap Gheal on a 3rd target should it be needed (which can in turn proc a super DI/PoM). Holy is also much better in Phase 4 in dealing with IQ's sustained AoE.