The personal heatmap is my favorite feature; I love how I can see trends on routes I take as well as see new route ideas that had not occurred to me. Sometimes I look at a section of road and think "that's really dark.. how many times have I ridden that?". The only way I can think to answer that is to make a private segment for every spot and wait for it to update previous activities. Personal heatmaps must have this data baked in to some degree.. it would be cool to be able to click and see the 'intensity' (how many times that area has been ridden).
