Matsumoto is the second biggest city in Nagano prefecture. But the station is not a huge terminal station, like Tokyo. But Matsumoto is the junction of many destinations by trains and buses. If you travel this area, you may have to change the trains and the buses at Matsumoto.
I have written about visiting Alpine Route from Tokyo as day trip. And then I have received an inquiry about day trip to Tateyama Kurobe Alpine Route from Nagoya. Yes. We can do it. You also can make it from Osaka and Kyoto as well.