Really different topic altogether! great!!
For Me,
1) Ticket Holder: I dint even tear that plastic over the sun visor, forget about using ticket holder!
2) Driver's seat height adjustment:I used it initially, once it is set, i never bothered to change the height. I am the only driver!
3) Manual key for door: In my Grand i10 Asta(o), I never used it except for the 1st time just for checking
4) Remote key for the door & boot: I rarely use the remote to lock the door, instead use that black button on the door handle.
5) coat hook in Rear grab handles or bag hook in the boot: Never used the coat hook and few weeks back i realized that there's a hook in the boot to hang your grocery bag!