Honestly, this domestic airport is so much better than the Haneda international airport. My fave part is the observatory deck from which you can see planes depart and land. I just like this airport so much.
Mannnn so many great memories come from this airport. I've flown to this airport 4 times for my stays in Tokyo and it has been great. First time was with my roommate and usually we get in around 10 so we sorta stay the night in the airport till morning and there are many shops around that time that are closed but still fun to walk around.
The place has wifi that has been saved on my phone since 2013. There is an observation deck that's outside to see the planes land and sunset sunrise which is a spectacular view. I have made many friends from meeting people here. The staff here are very friendly. Its easy to get from here to Akihabara and Asakusa. I recently came here with my cousin who almost got us deported by accidentally putting business on his declaration of departure, that was a fun tale I'll never let him live down.
I have flown to and from Haneda Airport Terminal 2 twice, and both times I have found it to be spotlessly clean, easy to get around, and generally full of convenience (and convenience stores).
There are plenty of shops, restaurants, and even a museum inside the terminal, offering you plenty to do whilst you wait around.
Great food and good prices add to the enjoyment.