That switches between apps, not windows. Open two browser windows and two terminals. Try to switch between one terminal and one browser without bringing all the other windows to the fore. You can't do it.
Windows (and most Unix WMs, I don't know where it actually originated) style alt-tab maintains a stack of recent windows. So you can hit alt-tab repeatedly to swap between the two most recent, or hit alt-tab-tab-tab to bring up only the 4th most recent window, etc.
ahh sorry I didn't understand. I'm so used to cmt-tab, cmd-` but I'm not at all claiming that's "most" efficient. makes sense why people would want that. I wish Apple would "just" add a fucking checkbox somewhere for that. Seems like a thing people really want.
Windows (and most Unix WMs, I don't know where it actually originated) style alt-tab maintains a stack of recent windows. So you can hit alt-tab repeatedly to swap between the two most recent, or hit alt-tab-tab-tab to bring up only the 4th most recent window, etc.