I took those questions as which healing classes I enjoy playing as instead of with. Due to this noob mistake on my part, I'm going to take the time and answer them correctly now.
- What healing class do you enjoy healing with most and why?
The guild I'm in only has 11 raiding members, and our sole focus as a guild is 10-player content. Due to this, I find myself with one other healer in the raid 90% of the time.
When it comes down to which class I enjoy teaming up with most, it would come down to a Druid. Since I'm Disc for most of the fights (I go holy for a few, but not many) I just find that the synergy between my shields and a Druid's HoTs works very well together.
I have the burst Single target heals and mitigation covered, and a Druid has the AoE/HoTs covered. Overall, it seems to work incredibly well.
- What healing class do you enjoy healing with least and why?
On the occasion that I do a PuG raid, or team up with another guild to do 25-player raids, I have to honestly say that the class I enjoy healing with least would have to be another Disc Priest... or Holy Priests that overly use PW:S.
As a Disc priest, my sole purpose is to utilize PW:S as often as possible. It's what the spec is built for. Needless to say, I get grumpy when other priests needlessly shield targets in raids that I'm a part of, and waste the WS debuff time.