Once you get the knack of leaning your wrist on your knee, aiming is no more laborious with the wiimote than it is with a mouse. You want to rest your wrist anyway, because it stabilizes your aim.
Some games support the classic controller, but most do not. If being lazy is all that it's about (and I can appreciate that, sometimes certain games go unplayed because I don't have the energy to play them), then you just have to be careful and avoid the more action-intense games. Big games like Brawl, Mario Kart, and Super Mario Galaxy should all be okay, while games like Godfather, Boom Blox, and anything using the balance board are going to be more vigorous than you're interested in being.
Oh, and the split-controller design of wiimote + nunchuk is the most comfortable controller design ever for when you're feeling lazy.

"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.