I think you need to have a few of those "I've use this pattern and had to stay up 24 hours to meet a deadline because shit was way too complicated for the delivered value" to instil a healthy fear of overcomplicating solutions.

I've worked with developers with 5+ years of experience that haven't went trough that (either corporate culture allowed them to deliver minimum value in 5 days or jumping projects before it gets to the WTF stage of complexity). It's hard to learn if you never get burned.