This perception strikes me as having warped in from a different decade. Nowadays, at least in my neck of the woods, developers almost universally use laptops, and Apple's still plenty competitive in the (high end) laptop department.
For the most part, the only developers I know who still use desktops are machine learning folks who don't like the cloud and instead keep a Linux tower full of GPUs in a closet somewhere. And then remote into it from a laptop. Half the time it's a MacBook, half the time it's a XPS 13. And they were never going to consider a Mac Pro for their training server, anyway, because CUDA.
I couldn't speak to power users, but my sense is that, while it meant something concrete in the '90s, nowadays it's a term that only comes out when people want to complain about the latest update to Apple's line of computers.