I have something to add that is not a pro or a con, but a realization that I came to for myself. That is it is important to keep ones distance and wait for it to die out. Otherwise a whole lot of drama can ensue because emotions run high and the ones in NRE can become aggrivated.
I remember feeling this way with Mono and have felt it when Nerdist is in love. No one could tell me I was over reacting that's for sure.
Yup, waiting it out and going with it seems to be the best bet. The change comes for the other when its settled down and there is a chance to get to really know the new person in their regular state. At least that has been my experience this far.