Arrived at NRT on 24 Nov.
Long queue for manual Customs processing.
Walked right 50 metres to the area for scanning Customs QR codes. No queue at all, several people waiting to assist me. I used a manual print out and was landside in 10 seconds.
Using a QR code is the best way to go!
NOTE: Just to clarify, this was a JAL flight so landed at T2. Many other international flights land at T1.