Absolutely but that doesn't mean that travel across such vast distances is possible. If travel at the speed of light, which is impossible for living things in my opinion, is the fastest form of travel the organism would have to live for 100Ks of years. Perhaps we will see an artificial light or radio signal one day that was sent billions of years ago but I don't believe we will ever meet any aliens unless, as I have said several times, wormholes do exist and may be employed by living organisms.
I agree that it is virtually impossible to travel the massive distances that would be required to visit extrasolar planets. Even those that are only a few light years away would still take impossibly long journeys to reach.
For example, the New Horizon probe (currently en route to Pluto) is the fastest space craft ever launched from Earth. It is traveling at 35,790 mph right now. This probe is stretching the very limits of chemical rocket technology. Basically, it's going about as fast as any rocket could ever go. Now, the distance in a light year is about 6 trillion miles. If the nearest "Earth-like" planet is 14 light years away that means the distance between our planet and it is roughly 84 trillion miles. Thus, at it's current speed, the New Horizon space probe would take something like 2.3 billion years to reach that planet.
As for wormholes, if they even exist, there would be the major consideration of the gravitational power of such a thing. Basically any tear in the space/time continuum would exert massive gravitational power (think black hole) that would totally obliterate anything we try to send even close to it, much less through it.