I generally agree, and we use HTML::Template on projects at work in large part because it keeps "web guys" out of programming. But one of those guys has a good knowledge of databases and can turn out a utility script when needed; we're considering the move to Template Toolkit because it would take better advantage of his skills.

For people who ought not to be mucking about with programming, well, just keep them out of the more complex templates. There's nothing in TT2 that stops you from compartmentalizing things to the appropriate skill level.