Right. It’s called amortization, and it’s not a scam - it’s math. It’s how interest works on a payment schedule. If you refi from 5yrs in on a 30yr loan to a new 30yr, you’re only putting yourself 5 years behind if you only make the new minimum payments. If you keep making your current, higher payment amount, thereby paying off extra principle each month, you’re no worse off and you’ll probably be better off because of the presumably lower interest rate.
But go with a 15yr if you can swing it. Much better rates. Just don’t overextend yourself.