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 open, vim with upgrade notes, and everyone connecting and working as needed. It beats the crap out of constant copying/pasting pieces of code and terminals on some IM program to make sure everyone sees what you're seeing.
I usually also end up running it locally and bypassing the terminal emulator and WM's multiplexing abilities, but it's more out of a desire to use the same tool whether I'm running locally or on some remote box. If you don't need the latter, it's a bit harder to justify using it, even though it still has some advantages, like generally being more scriptable.
> it also allows you to detach/reattach your running session
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
locally, I find the tmux buffer system (just like in vim) to be very useful for pasting text around the place, also, the newer versions have :choose-tree, which is well worth a look, using ^a s gives you a list of open sessions, from which you can choose what you were working on, and if you give your sessions sensible names (based on the starting directory for example) then you can switch between projects/jobs incredibly easily..
also, running tmux locally has the advantage that if you need to leave the office or go somewhere, you can still reattach to your work machine and pick up from where you left off.. so, in a sense, everything is remote
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 open, vim with upgrade notes, and everyone connecting and working as needed. It beats the crap out of constant copying/pasting pieces of code and terminals on some IM program to make sure everyone sees what you're seeing.
I usually also end up running it locally and bypassing the terminal emulator and WM's multiplexing abilities, but it's more out of a desire to use the same tool whether I'm running locally or on some remote box. If you don't need the latter, it's a bit harder to justify using it, even though it still has some advantages, like generally being more scriptable.