Well here's the rub, I work as a teacher, which is one of the most highly unionised workforces. I feel deeply sorry when I hear about the awful state of employment (in the US in particular). At will employment, 'unlimited' PTO, healthcare tied to employment etc. It's just so dehumanising and hostile. Doubly baffling is the average Joe's seeming distaste for unions.
Here's a sample of the conditions I can enjoy as a teacher here in Australia
$100k salary with guaranteed yearly increases that outpace inflation (this year was a 2.5% increase while inflation is at around 1.6%)
Guilt free, no questions asked sick leave.
Work-life balance. It was trivial for me to apply for part-time work. I now only work Mon-Thu.
Union-led, rolling negotiations for improved pay, working conditions, reductions to work hours etc.
It's the closest thing to a worker's paradise I can think of short of a post work, robot singularity.
Obviously not every profession is subsidized by the government like teaching and therefore can't, by extension, remain competitive while also being so worker friendly.
Even if you're not lucky enough to have such amazing conditions let's all at least call a spade a spade. Things like unlimited PTO are just ways to screw the little guy.