One big thing I can think of is that every time you use a credit/debit card, a transaction fee goes to a big bank/payment processor. With btc, it goes to a miner.
Other than that, how does it benefit you to use btc? I mean you need fiat to get btc, and then usually need to take fiat out. So where is the net benefit besides the fees being lost by the big banks/payment companies?
Well there are some factors that make a difference. For example bitcoin does't need any ID verification in order to create a wallet, try to open a bank account or a visa credit without giving private information. With bitcoin you just load your wallet with coins and pay.