Wow, really? Impressive. I'd *almost* recommend you get one, but at this point in the Wii's lifespan, it may not be worth it. I got a 32GB one, and it's got tons of stuff on it. DLC for Guitar Hero and Rock Band, and like, 30+ Virtual Console and WiiWare games. And I've barely scratched the surface of the card.
I also got another 32GB card for my 3DS. I'm determined not to let myself run out of space on my Nintendo systems, lol.