I did this recently for the same reason.

Do not wait and get a Linux system with i3 tomorrow. You will be so much faster and more structured in your daily workflow than with Alt-Tab.

A nice side effect: Apps feel much faster than on OSX. I don't know why but everything is snappier and just more resonsive despite a much weaker CPU and same hires screen on the Linux system. Especially the terminal rendering and application switching which is instant.