Its not all that scarey. Bump keys are for sale on ebay. Buy one and just try to make it work...not that easy. Any theif that will go to all the trouble to have all the bumpers will get in anyway.
If you want to upgrade your locks go for a 6 pin Medeco or similar. Schlage is a good brand and can be fitted with Medeco cylinders. Also avoid "keyed alike" deadbolt, passage lock combos. Even better have a different manufacturer's model, or at least a different key blank from one lock to another. Call a bonded locksmith, buy good stuff... not the Lowe's or HD junk.
Reminds me of the userid and password topic. Security is a pain, but necessary. If you're worried about it, do something about it. Peace of mind is priceless.