Me. I have to use a Mac at work, and I use the text terminal more than anything else on the computer. It doesn't help that Mac's don't have a good UI, everything is hidden behind extra key-presses, and switching between windows is a PAIN.
On a mac every window for an app is considered the same, so there's no concept of switching between windows (except with special hidden key presses).
When a window is in the background it doesn't receive clicks, so you have to click on it twice.
The menubar of a non-active window doesn't exist, so you need an extra click, first to activate the window, then to go find its menubar and do an action.
It's just a bad UI.