I am not sure that it serves people well here to dispense information that is not backed by the data or proof. I have not seen any data that would suggest that a "majority of people experience some sort of hearing issue".

"Ototoxicity" is also considered a rare side effect. In some cases even the tinnitus has reversed (in my case, my hearing actually improved in subsequent audiology tests post Tx).
It is, however, contraindicated for people with hearing problems to begin with.

In regards to the kidneys: "Nephrotoxity" is a rare and often reversible side effect. There is a precaution that if kidney function is inadequate to begin with then Cisplatin is contraindicated. The creatinene cleareance test is to insure normal kidney function prior to starting ct.

It is also vital to remain hydrated (although I did not, had cisplatin and still had no kidney damage).