I have a terminal open nearly all the time, too! I suppose I tend to just open multiple terminal windows, and resize/organize them with Moom (or just the mouse)

I have a terminal open nearly all the time, too! I suppose I tend to just open multiple terminal windows, and resize/organize them with Moom (or just the mouse). I can cycle between them on the keyboard, and Terminal lets me paste with middle click, has context right-click menus, etc. (I only recently noticed it has man page lookup in the right-click menu, and learned that if you option-click anywhere in a Terminal.app window it sends that as a mouse click to the app running inside it!) If I absolutely want panes within the same terminal, I run tmux locally. Terminal.app used to suck, certainly. I suspect a lot of iTerm users are long-term users who really haven't seen how much better Terminal.app is today than it was five or six years ago.