Yeah Im kind of realizing this too, we dont want rampant mindless liking. Part of what makes the vote here work is that you can compare posts with one another and see if similar stories were already submitted etc... What if we make the like button really small..."^" so that only people familiar with it will notice it? lol
On the other note, if vote count is the measure of content quality, the ease to vote should not adversely affect the system but improve it.