Most people think the Blue Cash Preferred® Card from American Express is just a "grocery card." And yeah, 6% cash back at U.S. supermarkets (up to $6,000 per year in purchases) and select U.S. streaming subscriptions is the headliner (terms apply). But the truth is it's got a few sneaky-good perks that a lot of people overlook. (American Express is a Motley Fool Money advertiser.)

So if you're thinking about applying, or you already have the card sitting in your wallet, here are a few underrated benefits to look out for.

1. Disney bundle credit: $84

If you're already paying for the Disney Bundle (Disney+, Hulu, ESPN+), this one's basically a big discount.

Just enroll your Blue Cash Preferred® Card from American Express and use it to pay for a $9.99+ auto-renewing subscription through DisneyPlus.com, Hulu.com, or Plus.espn.com, and Amex will give you $7 back each month as a statement credit. That's up to $84 a year. Terms apply; enrollment required.

And if you're not currently a Disney Bundle subscriber, it's a great little perk you can now unlock!

Ready to get rewarded for things you're already doing? Grab the Amex Blue Cash Preferred and get money back on your nightly streaming.

2. Cheaper gas with 3% back

Grocery purchases get all the glory with this cash back card. It's probably the main reason people sign up.

But it's also got a great rate on gas. And there's no limit.

You'll earn 3% cash back at U.S. gas stations and transit (including taxis/rideshare, parking, tolls, trains, buses and more) -- a common expense for most people. Terms apply. If you're commuting every day, driving the kids around, or heading out on road trips, those fill-ups can add up quickly. And with this card, so can the rewards.

3. Breathing room with 0% intro APR

Got a big purchase coming up? Or maybe you're trying to chip away at a balance from another card? This could help.

The Blue Cash Preferred® Card from American Express gives you 0% intro APR for 12 months on both purchases and balance transfers (then a 20.24%-29.24% Variable APR applies). That means no interest for a full year -- which can be a game changer if you need a little breathing room.

Just keep in mind: there's a balance transfer fee, and you'll want a solid plan to pay things off before the promo period ends. Otherwise, interest kicks in and kind of defeats the purpose.

But if you're smart about it, this intro offer can buy you time to pay down a big expense without paying a bunch in interest.

Still a grocery and streaming powerhouse

At the end of the day, the Blue Cash Preferred® Card from American Express is still one of the best grocery cards out there.

You'll earn 6% cash back at U.S. supermarkets (up to $6,000 per year in purchases) and select U.S. streaming subscriptions. That's up to $360 back just from grocery runs. And another 6% back on select U.S. streaming services like Netflix, Spotify, and Disney+ -- which adds up fast if you're subscribed to a bunch of platforms.

So between groceries, streaming, gas, transit, and that sneaky Disney Bundle credit, this is a great card for your wallet.

Apply for Amex Blue Cash Preferred and start earning 6% back where it counts.