Denounce is one of those talents you skip over if you are looking to maximize PVE healing performance. I put a couple of points in there and started machine gunning exorcism during heroics. The first time I ever felt like my "holy" DPS was fun. Watching those 5k and 6k hits roll over the targets was so distracting sometimes I would forget to heal. Not that heroics require much healing anyway.
It's all about Holy Shock now. I put on my 4pT10 gear to get the extra fast Holy Light after a shock, now Holly Light takes about .4s after a shock. Most of the time, I just wait for Holy Shock cool downs to heal during heroics. Working on using the combinations and procs more effectively is going to be fun when serious raiding starts again. I am looking forward to a totally new healing experience.