This probably depends heavily on the field but I have known a few people who graduated from these schools and found jobs easily, but were told by their company (after a couple of years) that they couldn’t advance further in the company without a university degree. This isn't to say that these schools are bad, after all you can get a good paying job with their education, but there is a trade-off that is being made.

Such as what fields, I'm wondering?

If you are saying like someone who went to school for nursing which is a college course and then they can't move on to be a doctor - I totally agree with you.

I'm mostly thinking of people I know in my field (software development and IT in general). With some of the certificates and diplomas offered in these colleges an individual can get a job as a programmer, DBA, QA, or technical support person but are often limited to entry level positions; and can’t become team leads, architects, project managers or business analysts because they don’t have a degree.

You may try to bring up individual instances and examples, but the numbers and general facts don't lie.

One thing to look for though is what the background of most students are who do get Bachelor, Masters, etc degrees are like. An interesting study I think would be to compare and contrast people from similar socioeconomic backgrounds who did and didn't go to college. But then there's also the individual level. Perhaps people who do go to college, to get "useless" degrees already have a high work ethic and qualities that allow them to get a higher income.

While some women might take offence to this, the pay difference between women and men who have degrees can (in part) be explained because women are more likely to get "worthless degrees" ...

While women represent (roughly) 60% of all university graduates, they represent less than 20% of graduates of fields like Engineering and Computer Science; and women tend to be in the minority in most fields that have a clear career path (with the prime exceptions being Nursing and Pharmacy). In fields where there is no career path without further education (English, History, Sociology, etc.) women often represent 80% to 90% of all graduates.

That is odd, that is my field and myself and friends have held three of the above four types of jobs you have listed, with college diplomas, and you are from Canada as well.  Strange.