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What you're failing to do is look at the situation three dimensionally. Most jets posess an initial climb rate in excess of 3000FPM. What this means is that within three minutes of the time a jet leaves the ground, it's easily well above the airspace that MOST small aircraft occupy. ATC also establishes corridors for faster and larger aircraft, and it's rare that we ever even encounter one of those "little guys".

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A smaller aircraft should obviously be more cautious and aware of potential wake turbulence, BUT the most notorious wake creater, the 757, received it's reputation after it was determined to be the culprit in two wake induced crashes involving 737's.

No aircraft, to date, is immune to the affects of wake turbulence but the 737 is the LARGEST aircraft that I know of that crashed as a result of wake turbulence. The loss of the American Airbus at JFK last year was theorized by some experts to be lost as a result of the preceding B747's wake. I haven't had a camera good enough to capture it yet, but at altitude, when a 767 or 777 passes over us the visible contrail creates two horizontal cyclones that exceed 3X the height of the aircraft itself. As Nexus stated correctly, the SLOWER an aircraft travels, the greater the intensity of the wake. Consequently, a large aircraft on close final must produce an enormous horizontal cylone.