Dear Henry -
While bread has been around the last 30,000 years or so, toast is a recent invention.
Toast starts showing up in literature around the 1400's and was traditionally used in drinks or soup. It wasn't until even more recently (the last couple hundred or so years) that it became a stand-alone treat.
I am of the lightly-toasted school of toast and generally prefer butter only. Occasionally though I like to splurge with blackberry jam.