I went with the stock 6 core too, and a 64GB upgrade
I work in I.T. and like a few others here - often use virtual machines. Truthfully, I could do what I need with the high end iMac but then I wouldn't have as flexible a monitor configuration as the 3 matched 27" displays I use now.
I need the screen space when I do remote support and take control of servers or people's desktops while keeping my email open on another display.
On the side, I game a bit and do some video editing and music creation.