Yes I do save coins. A couple of the mom and pop restaurants we frequent are either cash only, prefer cash, or charge for card purchases. And I try and pay in exact change and those places really seem to appreciate that.
And I only buy Lottery tickets with cash, usually coins.
Beyond that, I have quite a few "collectable" coins. My dad bought 200 uncirculated Kennedy half dollars when they first came out in 1964, those are in my safe deposit box. I have lots of Silver Dollars, along with Silver Certificate Dollar bills, and $2 bills. Although the $2 bills may not be collectible, they are rare despite still being printed.