The super-sized Jupiters were just easier to spot because of their size. Keep in mind that the entire idea of exoplanets wasn't confirmed until literally a few years ago, and it wasn't until this year that we found our first earth-like planet, on January 7th:
http://en.wikipedia.org/wiki/KOI-172.02
Then again that planet is probably inhabitable, but it shows that the process is starting to get refined; this entire thing is extremely new. The first time an expoplanet was officially confirmed was in 2003, so the entire process is only a decade old. In the course of the past 10 years, they have moved from one confirmed exoplanet to 942 confirmed exoplanets, and the total number of exoplanets is currently estimated to be in the area of 150 billion - in the Milky Way galaxy alone.
Keep in mind that there are hundreds of billions of known galaxies; if other galaxies are similar to ours, that means that there are an incredibly large number of planets out there. Based on the fact that we have discovered an earth-like planet (that most likely can't foster life yet, but still we found similar conditions), out of a limited number of a few hundred, then even if earth-like planets were one in a thousand that would still leave us with billions of billions (e.g. quintillions) of earth-like planets in the universe.
The odds are staggering that life exists out there besides our own. I find it highly unlikely, based upon the ability of life on this planet to adapt, that life doesn't already exist elsewhere in the universe. Even if the odds of an earth-like planet with the right conditions were one in ten thousand, that would still leave us with billions upon billions of earth-like planets. Given the humongous number of earth like planets out there, just out of sheer odds, I would say the odds are vastly in the favor of alien civilizations.
Think about how much humanity has advanced in the last century alone; we went from very basic cars to advanced vehicles like the Bugatti, put up satellites orbiting around our planet, came up with nuclear bombs, microwaves, robots, drones, AI, computers so advanced we can fit 128 GB on a single phone in the palm of our hands, etc.. Imagine how advanced tech will be yet another hundred years from now, or a thousand, or a million. Chances are that there are species out there that have existed longer than the entire planet Earth, given that there are other exoplanets out there billions of years older than ours.
In such a climate, of a vast network of super advanced aliens, we'd seem like a pretty damn backwards batch of bacteria in comparison. It's kind of like when you think of a bacteria trying to communicate with you; you just don't bother, because it's so small and insignificant - I'd imagine in terms of a universal scale, humans are that bacteria trying to communicate with a giant, or in other words our entire thousands of years of civilization no more equivalent than mold on a piece of bread to a more advanced species.
Our entire concept of individuality might seem alien, in and of itself, to cultures that have had a million years + to evolve and have a consciousness that hops from one body to the next.
The fact that we only figured out how to even see exoplanets literally ten years ago shows how backwards we are as a species, when you think of the idea of another species that had sight and contact with other exoplanets for a million years or more. More likely than not, the universe is chock full of intelligent life forms, waiting for humanity to get with the times and reach out across the vast distances of space using another method than what we have limited ourselves to.
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