Yes, very. 95% of all new houses are still the standard buildings, which are insulated, but only to the point where they meet the standards set by law. Only very few people go through the trouble of investing more into their houses to make them consume less energy. The only thing people do is install stuff that is subsidised by the government (like PV panels), but hardly anything else.
The places to be for true passive houses are Germany and Austria. The standards set there are a lot stricter than over here. They actually go for something that is beyond passive houses: the zero-emission house, which is completely self-sustained.