It's a lot simpler in my opinion to use the clutch and shift in a bike, if you can already drive a manual tranny car, there should be no problem adjusting. Just watch the downshifts, wrongly timed shifts can have your rear doing terrible things, and on a bike it's dangerous than blowing some parts in a car.
The other diffference is, you can't just shift the gear in neutral from any gear and coast sometimes as you can on a car. To do that on a bike, you'd have to be in 2nd or 1st, and well, there'd be no reason do that unless you've stopped.
But it's the other things that require 110% attention while riding a motorcycle.