Earlier quoted context omitted.
Personally I've moved from tmux to a tiling window manager with urxvtd. Less fiddly day-to-day and doesn't get locked up and horrible. Tabbing and whatnot are something the WM (in my case, i3) handle far better than a specific program.
If you're just using Tmux as a way to split/tab your terminals you're missing out on a ton of its functionality. For example it also allows you to detach/reattach your running session, which is invaluable if you're working remotely, and especially if you have a flaky connection. I've used it in several instances where there is more than one person handling DB upgrades and the like. You can have several panes/tabs ope…
I use dtach(1) for this. I'm sure tmux is far more powerful, but dtach is much simpler and does all I need at this point. It's still less than a year since I learned Vim, so I'm taking a break from learning arcane programs with a zillion options for a while :P