Yes, this is another "which healing class is best" thread but please bear with me.
I am the epitome of a casual player. Because of playtime restrictions, altitis, and canceling my account a couple of times, my highest level char is currently a 68 hunter, although I did get a DK to 72 once. I've had a priest in cold storage at 62 for over a year until the new LFG feature came out in 3.3. My previous healing experience was half a dozen or so Uldaman, ZF and ST runs well over a year ago. Needless to say this did not provide a particularly strong basis for doing TBC instance healing, but I've managed to get her to 66 over the last week or so anyway. Nevertheless, the learning curve has been very steep and the results sometimes painful.
Research and more play time will take care of getting down knowledge of the wealth of healing options, keymapping, macros, Grid, the specifics of the dungeons, etc. Unfortunately, nothing will change the fact that I'm partially color blind and over 50, so I'm never going to have youthful fast twitch reactions again.
I will never top a HPS meter and don't care, but I want to be reliable and useful enough so that I can see all the content I can, including (hopefully, some day) the 10 person raids. I intend to keep leveling my priest, because I'd really really like to get a char to 80 before Cataclysm, but I'm still somewhat worried about being viable with her on the high end content.
I've been considering rolling either a pally or druid alt and learning instance healing all the way from the beginning now that the new LFG seems to have made that a viable option for me, so I'm wondering, based on all your own experience, whether you think either of them would, over the long haul, provide a more forgiving platform for healing than the complexities of priest does. If so, which would be better, the relative simplicity of what pallies have available plus the fact that in raids I'd likely only have to focus on one target, or the smoothing functions of all the Druid HOTs? For aesthetic reasons I'd rather be a pally than a tree but I'll go druid if it appears to be the most forgiving route.
Thanks for any input.