We bought Samba de Amigo yesterday. It was our anniversary present to each other (yes, we're that sad!) It is brilliant, even better than when it was on the Dreamcast. Our friend Stuart had it and would bring it to our New Year's Day parties and we would hook it up to a data projector I had borrowed from work. Ah those were the days! (Of course the vast amount of alcoholic cocktails helped with the inhibitions of standing shaking maracas)
We started to get quite despondent. It took us about half an hour to configure the game. The key factor is the new version is not so dependent on height as the Dreamcast version, where you would have to enter your height into the game.
The Wii version also factors in angle of the wiimotes/maracas. If you are shaking high, point the wiimotes upwards. You don't actually have to lift them too much. For the middle shakes, keep the wiimotes level. For posing with both wiimotes to one side (this is where we had the major block in the configuration stage) point them behind you. It seems to work.
Happy Samba-ing everyone!