The easiest multiboxing healer is definitely disc priest because of the passive atonement heals (although monk could also be a lot of fun, if you are curious about learning that class. After levelling multiple mistweavers and mistweaver teams, I would caution that it might be tricky until about level 25 or so so you might want to quest your pair until then (or just q the healer for a solo dungeon or two as you learn the class).
I've shared my disc healing macros before, but basically you want to shield @focus whenever it is up, holy fire whenever off cooldown, and then smite smite smite.
I've honestly enjoyed multiboxing with everything but paladin healers (I just don't like paladin healers so I've never levelled one past 20), but disc priest is definitely the easiest way to go. And priest is the best thing to have at max level, anyway (one of the two healing specs has historically always been strong, unlike other classes where they seem to have a weak phase every couple of years).
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