As far as the NIMBY conversation goes there are a lot of reason to oppose a development, as others have stated. Here is an example happening "in my backyard" in Brooklyn that I oppose:
Right now the area is occupied by industrial lots. The development will add 4,000 residential units, mostly unaffordable for 75-80% of the folks who live in the city. The developers claim they want to create a new community in Greenpoint. However the city won't be adding any schools to the area. Greenpoint currently has some of the better public schools in the city. Greenpoint also has a huge Polish community that has been in the area for years. Tons of Polish interest stores, bakeries, etc. What do you think will happen when the yuppies move in? Real estate prices will rise and the schools will be overrun with little Cullens, Wyatts, and Floras while the long-standing families will be priced out.
Not only is this bad for the already established community, the buildings make the neighborhood look like some shit hole Miami neighborhood.
Here, I will consider myself a NIMBY. It isn't really affecting my life, I live in Williamsburg, a neighborhood bemoaned by millions as an example of gentrification by hipsters. I moved in 5 years ago but I can see how this Greenpoint landing project will suck ass for a whole bunch of people I consider neighbors. (Greenpoint is next to Williamsburg if you aren't familiar with Brooklyn).