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?
You are being short-sighted here, it's not all about the payments as a currency for buying stuff. It's also about financial freedom, it's about having your money when you want it and spending it where you want it and not about capital controls that have hit Greece for example. And also it's about not having to answer to the questions, why are you withdrawing your money from your bank account!
It's also about financial transparency and not about printing dollars when you feel like it. It's about time, try sending a wire transfer form France to US for example. It's about cost, how much will bank charge you for that bank transfer.
It's about many things!