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