Who is the most powerful healer in wow?

I'm curious, who do you think is the most formidable healer in the vast world of Warcraft? With so many skilled characters and their unique abilities, it's quite a challenge to pinpoint just one. Could it be the druid with their extensive knowledge of nature's magic? Or perhaps the shaman, who harnesses the raw power of the elements to mend the wounded? What are your thoughts on this, and why do you believe they hold the title of the most potent healer in WoW?