Loob and the star are too polite to point out that you made a typo in the second sentence. (It might be nice to yo-yo around, but that isn't what you meant either).
But I object to the star's suggestion that the intensity increases as we go down your list (I assume increasing intensity was implied). I think the first sentence is more intense because it is more personal. The second and third sentences sound more circumspect, since they start with the impersonal "it." I would certainly prefer to be told that I am nice to have around, rather than be told that the conditions, when I am present, are nicer than they would have been in my absence. Ok, I've made it more extreme, but that illustrates my point.