This reply is directed at PvP, I side with OP as far as PvE goes;
Benevolence is used quite a lot during my rotations, it gains more use than Deliverance.
Reason is that I use the Conveyance proc gained from Rejuvenate which increases Benevolences crit chance by 60% as well as Healing Trances crit chance by 25%. Those tend to be my main 2 heals for that reason, which gives me the option to drop out Critical Rating completely from my gear, replacing it with power and giving more beef to my heals.
The times I do use Deliverance tends to be when I activate Force Potency (increasing it's crit chance to roughly 90%).
The fact that my main heal I use crits 90% of the time, has a shorter activation speeder (something like 1.3s compared to 2.3s for Deliverance) and gives me the option the drop out a stat completely in place of power seems much better to me.
Just another way to look at Sage healing.
Gunshin.