Everyone's different. I am someone who tends to keep my expectations as low as possible, so even if I am infatuated with a new lover, I might feel totally gaga and titillated and having ridiculous fantasies about him, but there is the other more grounded side of me that is talking me down out of the clouds because I like being present, having my feet on terra firma, and being as logical and practical as possible. Therefore, I never really deal much with NRE.
So, don't worry if NRE is not something you have had to deal with. Remember that people tend to post mostly about dramas and problems on online forums. There is a ton of members here who only lurk and may or may not experience most of what you read here. The frequent posters are a small subset of people who login here, and an even smaller subset of polyfolk everywhere. So, it isn't practical to assume that what you read here is "typical" for most polyamorists.
In fact, I often smirk when I read a lot of these posts that go on and on about NRE, because I think a lot of bullshit that is blamed on NRE is really due to other factors, like irresponsibility, selfishness, vindictiveness, unreasonable expectations, etc.