Not an experienced mouse free|multi terminal workflow user but I find Kitty, as an alternative to terminal + tmux, is quite productive. It just works and has features I-a beginner-need like tab, tiling, layout switcher, and default memorable shortcuts.
Tabs, tiling etc are something many terminals offer, e.g. terminator or konsole. What they do not offer are things like running in the background or (re)connecting over ssh.