If you're just looking to get around and not transport children, motorcycle is the way to go, you will never hit any traffic. On my way to work every morning, the highway is always backed up a couple KM. You can also park it for free in most places
I heard that the motorcycle riding here was extremely dangerous, but I can say after a few months of riding here, it's no worse than in the states. You can pick up some pretty decent bikes in the 400-600 cc range for sub 25K. I even saw a CB400 in decent shape for 10K the other day.
Now, that being said, I'm not anti car. I will most likely get a car next year as I think I can get my boss to package it in for my contract in 2019. Also, who wants to ride a motorcycle in the rain, on the rainy days I usually end up on the MTR or or the bus.
Ideally, if you're going to end up getting a helper, you can get one who has a license here and can also serve as your driver so then you can avoid the parking fee at work, which can be as expensive as hiring a helper, and if you're stuck in traffic just use that time to bang out some email.
I want to move to Sai Kung next year, but as my wife works in central thats going to be a no-go unless we have a car and a driver/helper.