Another difference is that we sent Voyager traveling orthogonally to Earth's orbit. Well, not exactly, but you get the point...
> Voyager 1 is now leaving the solar system, rising above the ecliptic plane at an angle of about 35 degrees at a rate of about 520 million kilometers (about 320 million miles) a year. Voyager 2 is also headed out of the solar system, diving below the ecliptic plane at an angle of about 48 degrees and a rate of about 470 million kilometers (about 290 million miles) a year.
Exactly - that's the part thats truly amazing. 30000 years to the outside of the oort cloud - thats still in our system (border of it) - not even scratching the universe in the faintest.