On a modern integrated-design airliner, all of the following can come off the IRS:
FMC
FCC
Thrust management computer
Pitch damper gyro
Yaw damper gyro
Weather radar scanner stabilisation
Anti-skid auto brake systems
ADI
HSI
IVSI
RMI
Flight data recorder
No doubt others can think of some more as well.
It's more than just your navigation.