I am using GNU Screen as a terminal multiplexer.
I am using screen as long as i remember my self using ssh.
I am not against tmux, I just really dont have an opinion on it.
So this is for all you people that are using screen and you want a quicker way to switch from one terminal to another.
Open your .screenrc and just add the below lines:
bindkey ^[[1;2D prev bindkey ^[[1;2C next
The above bind keys tells screen to switch terminals when using shift key with left or right arrow
⇧ + ←
⇧ + →