[coel]

If you have lots of luggage going to the airport, the "limousine bus" services (they are just coach buses) are a good option if you're near one of the pick-up locations.

Allowing two bags per person, it was cheaper for us and didn't need to send it two days in advance.

[johnwalkr]

In the 90s, you used to be able to checkin, bag-drop, pass security and pass immigration at the bus terminal in Nihonbashi, and take a bus to Narita and bypass everything and go straight to your gate.