I agree. I have a druid/warrior at like 42 and the druid is caster spec'd. his normal heals are more then adequate for questing and his additional damage is handy. I do not put him in oomkin form and, when you get to that level, would not put your priest in shadow form. Keep him normal to pop heals when needed but kill mobs at the same time. VE & VT will make things even easier when you get them.

my 2c