Yup, every video I've seen by the Lock Picking Lawyer shows him either picking the lock or using a hydraulic bolt cutter. A cordless grinder/cutting tool would be more portable and somewhat less noticeable -- other than the sparks.

My solution? Don't ride a bike I can't afford to replace over a weekend of browsing on craigslist. If I don't want a bike to be stolen, I don't even carry a lock so I'm not tempted to think it's secure while I go inside a store or coffee shop. If my bike isn't welcomed inside that fast food joint during their off-peak time when there are few or no customers, I don't go back to that restaurant.

My road bike rides are all out and back. I have a couple of inexpensive hybrids that I take for errands and casual group rides where we might stop at a restaurant or pub. I can replace those bikes for $200 or less. My medium size On Guard and small Kryptonite U-locks are good enough for that. Some of our usual pub stops welcome cyclists so we take 'em inside.