I've always appreciated countries that use large-denomination coins, or at least in larger denominations than we do in the US. When I lived in Arizona, I would often make trips into Nogales, and part of the fun of those trips was that I got to use the the coins. It just feels more like "real" commerce when you're paying for stuff in coins rather than slips of paper.
Here in Mexico, we have a 10-peso (US$1) and 20-peso (US$2) coin, and I'm a big fan of both. Although I should tell you that the later is not as common as the former. Nevertheless, they are both in circulation and are used quite frequently. You will recall from previous posts that change in general is an important thing in Mexico, you need to carry change with you everywhere.
Last month, for example, I went out to pick up a large pizza, and I paid for it with just a couple of coins. When you come from a country where the quarter is essentially the largest coin in circulation, and the only purchases you make with all coins are for things like packs of gum, you really feel like you're getting a bargain when you pay only in coins. So when I got that pizza, I felt like,"Wow, I paid nothing for that!"
Of course, I didn't really pay nothing for the pizza, but it's nice to at least treat yourself to that sensation.