I was grateful this year that Eurosport covered certain stages from the start. A lot happens early on, with breaks trying to get away, crashes, climbs, scenery, etc. Remember that it's intended to be a TOUR of a country. Towns pay money to be a part. There's a reason why there are scripts describing castles and monasteries and that the helicopters make sure to circle those areas. People put a lot of time and effort into road art as well. Just as the teams are there to promote their sponsors, the big picture is also to promote tourism, not just for the three weeks of the race, but by showing television viewers great places to visit.
There's a lot more to the event than just the racing. We don't see it, but the caravan itself is like a major parade. The Giro is really proud of theirs, and a lot of people go out to party.
There are highlight shows and videos of the final kilometers if you don't want to see it all. It doesn't that more shouldn't be covered for those of us who want to see it in depth. The Tour Down Under would be a bigger deal internationally if they didn't get us excited for racing and then not show most of the race.