http://commons.wikimedia.org/wiki/Category:Images_from_Wiki_takes_Amsterdam thats where the pictures can be found. The biggest problem are the narrow streets, but waiting 5 minutes wont make the streets larger, so taking a decision on an angle an do the best you can. The thing is that these monuments are monuments, but quite a lot of the same (there are 8000 monuments in Amsterdam, 7000 of the look like that). The idea is that we want to have a wide coverage, people should be able to see how the monument looks like. And that, with time, quality will improve. I think  http://nl.wikipedia.org/wiki/Lijst_van_rijksmonumenten_in_Rotterdam_(stad) is a good example of the maximum quality you can achieve. In Rotterdam one person made it a two year project to photograph all monuments with decent quality, for some parts he waited half a year for the sun to be in the right position. That is more the 10-60 minutes/monument approach. Offcourse we prefer the pictures in Rotterdam for their quality, they are simply better, but time is limited and with the goal to photograph all 60.000 monuments that approach simply takes 10 years, so why not, at first, take 40 pictures a bit faster in the time you could also make 1 very good picture (and offcourse there is talent, experience and material which makes one person able to make better pictures, but limits for example myself in which pictures I'm able to provide).