I just bought my 07 4Runner in December, used Certified w/ warranty, 35k on the odometer. I'm not going to bore you with details, but some of the other cars I've driven have had many issues, and two of them were Mercedes models. I'll grant that none of these problems are unintended acceleration.
Every car has a problem. So far with my Yota, I've noticed there are some gaps in the timing of my command versus its response. I've also noticed the thing will go about 10MPH without me ever pressing the accelerator.
Here's my thing: I'm a programmer, and I'm a decent one. That little brain they call an ECU fascinates me. But guys, if it's an ECU problem, then it explains everything, even why they've had so many problems tracking it down. Programmers can spend years finding a simple bug in a program. More than that, if Congress would extend its newfound focus and expertise equally across all car manufacturers, I'll bet they find some major glitches in a lot of other brands. No code is perfect. Every program has bugs.
One of the best examples of this I can give is the on-board computer of an F-16, appropriately and pseudo-affectionately nicknamed HAL by pilots I've talked to. The plane needs a computer to constantly adjust to the pilot's commands, but there is rare occasion where the pilot and the computer disagree...literally, the pilot attempts to do something and the computer decides it's not a good idea and refuses. They're trained to expect it, trained to turn the computer off in an emergency like that, but then the computer reacts by attempting to kill the pilot and crash the plane. Again, they're trained to deal with it. This is a heavily tested, extremely expensive, military-grade ECU...that STILL has bugs.
I could go on about this. All I have left to say is I know how to drive standard, know where Neutral and the E-Brake are, keep obstructions away from my feet and always have an emergency plan. It's a good idea in any car, not just an allegedly unsafe Toyota, because you never really know what a car's weakness is.