I am rather picky. For my first 6 or so villagers, it didn't really matter too much provided that they were located on the south island of my town. Then my 7th villager moved into a particularly nice spot and I put in a lot of effort into getting the 8th, 9th, and 10th villagers of my town to be aligned in a certain way. It became a real importance for my last two villagers because I had pretty much fully pathed my town at that point and I didn't want my villagers to move into an unideal spot where I'd have to work around their houses since my town is pretty compact. I think I spent around 6+ hours to get Purrl to move into an ideal spot and 10+ hours trying to get Tom to move in where a previous villager moved out @_@.