As well, Flash of Light is really weak. It's still highly efficient, but it just isn't powerful enough to handle current damage levels. Holy Light has pretty much become the weapon of choice these days.
Because I like trying to kill two birds with one stone, here's an idea to help both problems:
What if a paladin had a glyph or high-level talent such that casting a Flash of Light automatically cast a second Flash of Light on a injured target within 10 yards. Flash of Light would become more useful, we get a little taste of smart healing, our throughput when raid healing would increase, and we could hit more than one person at a time. I think it would still be weaker than the three other classes at raid healing, but it would close the gap some.
Here's my idea in Glyph form:
Glyph of Light's Mercy
Your Flash of Light heals an additional friendly target within 10 yards. Increases the cost of Flash of Light by 100%.
So Flash of Light's cost doubles, but we can use it to raid heal somewhat effectively.