I always tried to free up hotbar slots and macros by using Clique and just click-healing with the priest. In PVP, I just spammed CoH and once the "holy crap" part of the fight was over I'd go back to normal heals.

Click healing in PVE is, IMO, a MUCH more efficient and versatile method than macros for that group composition. This obviously doesn't apply to groups with normal tanks.