Anyone who never uses the parking brake needs a check up from the neck up.
1. If the cables get rusted and seized through lack of use it won't work when you need it (and in the UK it won't pass the annual test)
2. If you park on a hill the propshaft flex joints and engine mounts (not to mention all the other components mentioned) are under permanent stress
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)