Extra humidity has helped the visible hardships of the plant, it's pretty and green, but it's still not thriving. For those looking at the light aspect - my dill, basil, and rose cuttings from last summer are thriving--so I really don't think it could be that. It wouldn't make sense for basil to be doing great and cilantro to be suffering.
I just killed my 1000th maidenhair fern so I'm adamant that cilantro and I will find a way to partner up. Plus, I love cilantro and it goes to pieces after a day in the crisper, so I'd like to be able to always have it.