Add a progress bar under the current track in playlist. This way, we know exactly which one is playing and its current position.
Thanks for keeping us informed and for your contribution. I am curious about what problems you had ?
I only have a 150Gb collection. It is mostly working fine (especially when coupled with Baloo).
The music collections is in an external drive and was probably not indexed by baloo. I can do some test with the external drive mounted somewhere in my home directory and indexed by baloo.