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They're fun! Something about soft pulsing colors is just...nice. Properly diffused, they go well with art, to accent rooms, etc. I've never seen them used inside of a PC, though, which made this project page a bit confusing. Is that a thing now? Because that does sound like a garish and distracting place for them.
Yes, that's a thing now. My 12y nephew just asked for an RGB fan for his birthday... Apparently they're cool
Personally I do like lighting, but I want static colors. The great thing about RGB lighting is that I can choose whatever color I want. Much better than when the choices were basically just red or blue and you had to commit to one when you bought it.