Yes it eventually finished, took about 15-20 minutes though.
I thought something had gone awry, so I was rebooting before the journaling had finished. Then using openSUSE 11.2 & sidux live CD to see if I could simply delete the music collection I had copied over to the new drive.
Even when in live CD mode, the journal was doing its thing. In the end I went out for dinner, leaving my PC to its own devices.
Thankfully, when I got back; I was greeted by my login screen:)
Generally journaling is completed when you shut down correctly (ie just not power off) But you copied a TB that is is one heck of a lot of data. So you did not give enough time to allow the system to move the data from the journal to the FS. Also maybe you mounted the drive without the journaling turned on. It is possible to do that. Then when you restarted with the drive mounted normally the OS had to complete the journaling process and that takes time for a TB.