I've been dissociating a lot lately. I'll "come back" and have zero recollection of what has transpired over the preceding hours. Zero. But I also can't recall day to day life after a day or so, even times I know I wasn't dissociating. When I wasn't displaying active PTSD in my early and mid twenties, I formed a lot of daily memories. I still have those memories. During those days, I'd have a good general grasp of what happened through the day, and would have lots of specifics on top of that. I worked at a daycare during that time and I can still recall the names and faces of over 60 children I cared for. But I can't for the life of me recall the name of even one classmate from the semester of college I finished last week (it's not a standard schedule - semesters are 10 weeks; there are 5 each year).
IN short, I don't know what it's like for a 'healthy' person, but I'm reasonably confident that this is not it.