So I normally play caster healers in most MMOs. I went with Templar for my first character, have him up to level 22 and have done some group content.
I'm a little disappointed. I know the class was originally designed as a melee healer, with Warden defensive spellcasters canned, and I think that shows in Templar design. All but one of the heals (rushed ceremony) being pbaoe you need to (roughly) position yourself in the middle of your group. It's not ideal for my tastes but probably great for melee types.
I love the other two Templar skill lines and considered ignoring most of the Templar heals (except rushed ceremony of course) in favour of restoration staff heals which are more to my liking. But, if I'm reading the skill descriptions in-game and on the online builders correctly, Templars are the worst class with restoration staff heals.
Sorcerers get surge which boosts weapon damage and accordingly resto staff heals. I crunched the numbers on my level 9 sorc with a level 9 weapon and surge's description had it boosting my weapon damage stat by about 30% which equated to a 13% increase in healing output for abilities. That was only for a level 1 surge too. I have to assume the weapon damage stat boost gets bigger as you level the skill?
Dragon Knights get molten weapons which also boosts weapon damage. Its magnitude of effect is of course much smaller than surge, since it has a longer duration and also affects allies. But DK's also have the igneous shield morph which boosts healing done by 30% for 6 seconds.
Nightblades get a weapon damage boost from drain power plus a selection of HoTs which would stack nicely with resto staff HoTs. And haste would let them execute the resto staff heavy attack heal more often.
Templars get a 4% weapon damage boost from the balanced warrior passive. Their only other weapon damage boost comes from the power of the light morph and it doesn't seem to last very long and seems to be much smaller than what other classes get.
So it looks like Templars are the weakest profession with restoration staff heals. I don't underestimate the value of rushed ceremony or rite of passage. No other profession gets an equivalent (currently - may change with spellcrafting?). But as someone who wants to play a stand-at-the-back-of-the-crowd healer using mainly resto staff heals, it looks like Templars are the worst option for me?