I think the developers wanted to make a greater emphasis on exploration. Generally, I like the change as now explorers actually mean something, and also there is still unowned land in later eras which I really really like. It's more historically accurate, too to have that.
Regarding the satellites, I actually like that it doesn't just reveal all land everywhere. However, I kinda wish there was a compromise fix to this where you could choose a large 9 or 12-hex (or so) spot to train your satellites on. For each turn thereafter this same area would be revealed automatically unless you changed the location of your satellite.
This way you have a new ability to see somewhere, but you still have a strategic choice of where this is. Would make it fun and still require you to recon for enemy force buildups, wonder-building, etc.