Not GP, but plutonium is overhyped in how scary it is.

Don't get me wrong, it's super deadly, but there are loads of toxins that are more deadly than plutonium. And while its radioactivity is seen as ultra scary, it's actually pretty nice, because you can at least detect it. Harder than beta or gamma, but still, it announces its presence.

How I wish I had a magic wand (spectrometer) that I could wave over my food to see if cyanide, ricin, mercury, or lead were there.