Heh, I have NEVER shaved my thighs... maybe once if I was going to lay on a beach all day or something, but it seemed like a waste of time to me. I have dark brown hair, so it probably is noticeable... but it's still quite fine and I don't care. And I would never shave my arms, no way. Very dark brown hair there, but whatever. I like it the way it is.
Hell, I've practically stopped shaving my lower legs and armpits, other than a couple of times a month.
I just don't care anymore, unless I am going to be blatantly exposing my flesh to the world (shorts, swimsuit, etc), which I rarely do in Iceland. (Too cold!) My husband is totally fine with whatever I choose, which is nice. I suppose if I could get all my hair removed, that would be the best thing, because I just hate shaving and how much time it takes, etc... I guess I just never saw any benefit to doing it, personally.
Each to her own.