At the job I left last year, my physical illness was treated with far more compassion than my mental illness. After my breakdown, my employer complained that I hadn't given a timeframe for when I would return to work. No such comment was made when I was hospitalised with IIH, in fact they encouraged me to work part-time for a bit.
The place I worked this year, my boss took it upon himself to inform me that one of my team had suffered from depression in the past. That's the same as telling me a member of my team was in a car crash or broke a leg a couple of years ago. I just shrugged and said I'd also suffered from depression, I didn't see it as something I needed to be told.

The stigma is there, its probably the biggest stigma at workplaces.