I was also under the impression that there were a number of improvements to aid with a mouse driven workflow. Improved MIDI editing to name one.
It seems to me, on these boards, that a lot of the Push resentment is based on individuals trying to convince themselves that they don't NEED it and their workflow is just fine.
Personally, I have done a lot of music creation with the mouse in the past. I currently own Push and have not had as much enjoyment making music in a long time... or am I trying to convince myself that forking out almost a grand was worth it?