While I figure there's a near certainty that there is life, intelligent and otherwise, all over the universe, I find it near unbelievable that a technology has been developed by anyone to navigate the vast amounts of space that must be traveled in a time that is nearly unimaginable.
Einstein might be wrong that we are limited by the speed of light, but even approaching the speed of light with any significant mass seems rather unlikely. Now, wormhole theory is certainly plausible, but I can't imagine a scenario where a vessel would be able to travel through one undamaged.
Alien technology is certainly not limited by my ability to imagine it, but if you can move through wormholes I also can't imagine getting caught up in crop circles and probes. :-)