You seem to be torn between wanting to be able to help people vs playing a chill/laid-back class. For chillability, I'd say necro -- the ability to FD anytime is huge, you can solo very easily/safely, and you can support groups actually pretty well, even save groups from wipes with screaming terror (mezz), but at the same time your group is probably not gonna wipe because of something you did or didn't do. Also, lich is really no big deal at all
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Wiz could totally be chill if you level in groups and then become a port/nuke master in raids -- but quad kiting, their main solo option, is most decidedly un-chill, bra
EDIT: if you decide that wanting to help people is your main priority, then id say druid hands down. porting, plus the ability to toss noobs a regen or thorns or skin to totally make their day.