I use a tiling window manager and use tmux - just because I can tile windows doesn't negate my use of tmux.

I have a single window that is all of my terminals - which to me is much easier to manage than a load of random terminals all over the place. Sessions are named, and windows are named, and I have F1-F8 mapped to load the corresponding window, F10 brings up a list of sessions, and F9 toggles between the last 2 sessions.

Mine is based on https://github.com/gpakosz/.tmux but customised for F keys, status bar, mouse etc