We too have lots of amnesia and don't really know how much we have until circumstances bring it to light. Like you we don't often have massive chunks of time missing, and we don't even often experience suddenly being somewhere different, although that happens from time to time. Most of the time I think I'm going through life fairly normally (my version of, anyway) and then things happen that make me aware that I wasn't aware... I find things done that I haven't done (but meant to), people talk to me about things I don't remember (but should), or time just.... goes.
I just don't seem to be aware of when or where or why this happens.