Really think most of this stuff is people misunderstanding the nature of memory. When the riding is non-eventful, you're not likely to recall any details. I find that if I'm riding a route I do routinely, I will space out thinking about other things so much that I'll suddenly realize I'm not sure whether I'm at mile 23 or mile 27 or whatever until I look down at my GPS or see a landmark of some sort. I'm fully engaged with riding safely the entire time, but I'm not really paying attention to where I am geographically or how long it's taking me to get from point to point, thus none of that gets "recorded" into memory. When I try to recall it, it will just seem like missing time. I can't be the only one who's missed an exit on the freeway while driving for the same reason, right?