In Mexico, afaik, only Tenochtitlan was razed, and basically only the Templo Mayor. Mexico City was largely built on top of Tenochtitlan. The street lay out remained, so I'm guessing that most of the city was left standing as housing and so on. Most other indigenous towns remained standing, with Spanish settlements built next to them or close by. For example, Antequera (the original name of Oaxaca city) was built just a couple of km away from Zaachila (the main Zapotec city in the area, at the time). Same with many other towns, most actually still have the original indigenous name combined with a Spanish name, eg, San Juan Chamula, Papantla de Olarte, or Calpulalpam de Méndez. Many other towns kept their original names, until today, examples are Patzcuaro, Tlaxcala, and Papantla (out many others). The Spanish were interested in converting the people (and yes, using them for labor) not so much in displacing them to acquire their lands, and they mixed in with the local population (ie, with inter-ethnic marriages). I understand that the process in Anglo and French America was completely different, though, but but I wouldn't say that "auto-raze", at least for Latin America (outside of the Caribbean), would be the most accurate description of the colonization process.