When I started contributing to OSM, my favorite uploads were new roads that did not appear on the map and adding bike lanes. Then I started fixing mistakes in the TIGER import and adding POIs. However, there must be something about doing this over time that makes one want to add more and more details. While I first thought tagging traffic signals and speed bumps were too much detail, I'm now inclined to do it as time allows. Anyone else fall victim to this behavior?