Interesting thread. As someone alluded to already, it's a bag of tools to suit various peoples' needs, but it still gave me pause for thought at the sheer quantity of things I don't use. Most I don't need, or have tried and don't like and there must be some that may be helpful if I took time out to learn them better.
Video View
Matrix View
Staff view
Lyric view
Console view (used only sometimes)
Multidock
Beatscape
Surround Sound
Navigation strip
Step Sequencer
V-Vocal (Melodyne instead)
AudioSnap - every time I try to use it I can't get it to help me with what I'm trying to do)
Session Drummer - any version (XLN Addictive Drums far better)
None of the synths except z3ta+
All the plugins except Lexicon Pantheon! (Instead: TRacks3, FabFilter, Ozone5, EZmix, and others)
Screensets (sorry, FBB!)
Arpeggiator
Publisher
External Inserts
ACT
Rewire
CD burning