Comment by liber8

It sounds like you've discovered the secret to travel. You don't have to see all the sights or cram everything into each day. Usually you get more out of it if you take things slowly, be intentional about what you really want to do, and savor each experience. With two small kids now, we usually pick one city per trip and plan (at most) one morning activity and one afternoon/evening activity. Sometimes it's one activity per day, sometimes it's none (maybe we just meander around a neighborhood between meals, like your Virtual Japan experience). Like you said, if you see 10 different Roman churches in one day, the Sistine Chapel becomes just another fresco.