Neither have I. Most of my software career has been spent in medical device development: a tightly regulated industry, and waterfall is just a concept.
Sure, you do requirements elicitation, review and documentation, and then architectural design, followed by detailed design & coding, etc. But it's never a linear process end-to-end. There's always feedback. There's always something you didn't account for showing up and requiring a change to an earlier part of the process.
Waterfall can, and does work, but only on fairly small projects that can be completely defined correctly the first time around. And like everything else, it's easier if you've done that kind of project before.
Sure, you do requirements elicitation, review and documentation, and then architectural design, followed by detailed design & coding, etc. But it's never a linear process end-to-end. There's always feedback. There's always something you didn't account for showing up and requiring a change to an earlier part of the process.
Waterfall can, and does work, but only on fairly small projects that can be completely defined correctly the first time around. And like everything else, it's easier if you've done that kind of project before.