I can give you some anecdotal evidence that supports what you're saying. The very large health care company I work for now is currently redesigning their globa

I can give you some anecdotal evidence that supports what you're saying. The very large health care company I work for now is currently redesigning their global nav. We've had no less than 10-15 design working sessions. The same thing that continually comes up is the hamburger menu and how to handle it. The reason is the company did some pretty extensive research with seniors (a big chunk of our clientele) and found many don't have any idea the hamburger menu is a standard menu now for both desktop and mobile apps. We were told we either have to use it minimally, or not at all. Its been a struggle to find something that everybody can agree on. We have a very small team of 5 people - 2 designers, 2 devs and myself (accessibility) working on this. I also happen to work in accessibility which many of the apps/sites that use hamburger menus on mobile either create keyboard traps or are totally unusable for screen readers. I'm at least happy our company is trying to move to something different.