I don't know where you're hearing these stories, but one, I haven't heard of many stories of people getting infected beer from plastic buckets. Actually, not many have proven that it was the bucket at all. In fact, if you go to the "Is my beer infected" thread, I think you'll note that 90% of the photos are from those with glass carboys. Two, I haven't heard of ANYONE getting sick from a beer period... bucket or glass.
Good sanitation is good sanitation, whether you are using plastic or glass. Straying away from plastic buckets because they may cause an infection is, for lack of a better term, ignorant. And I don't mean that in a condescending way at all. It is just entirely misinformed.