Motor mooching is a great way to fish especially for kings. The advantages that I see over straight mooching are that you cover much more ground and kicking the motor in and out of gear allows you to cover more of the water (depth wise) automatically. I have had many kings hit the bait as it was dropping after putting the motor into neutral. The advantages over straight trolling are that you can use much lighter gear and you are fishing different heights in the water table. It is a great technique and doesn't require some of the equipment (fishfinders, downriggers, etc.) that other methods use. To be most effective, motor mooch in the direction of the prevailing tide/current. Go for it!!
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"You're not a g*dda*n looney Martini, you're a fisherman"

R.P. McMurphy - One Flew Over The Cuckoo's Nest