Returning player, questions about healing classes and specs.

Questions about healing: I'm a returning player with a level 60 of each class. I have all souls available. With that said, I have a few questions about what the best healing class would be in different situations when I reach level 65.
1- best healing spec for running expert dungeons (I find this fun)
2- best healing spec for single target healing
3- best healing spec for AoE healing (in general, or in big groups)
4- best healing spec for pvp
5- best healing spec to just dick around and be able to lololol top healing meters in big groups
6- what is your personal favorite healing spec, and why?

Thanks for taking the time to answer!

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Returning player, questions about healing classes and specs.