Certain ideas are so reasonable that it's hard to imagine you ever considered any other alternative. The Earth revolves around the Sun.
Tomatoes are edible.
A program without goto statements is easier to read. XML is a great way to describe data. Prior to XML, every small discrepancy between how two companies represent data was a crisis. In retrospect, one of the most remarkable things about XML is that it took so long to happen. Full-blown SGML is powerful enough, but it's cumbersome.