I love job control! And as usual, Julia Evans explains it in a clear and straightforward fashion.

I would add that as a shortcut, you can just type % (without fg) to foreground the current job, or % and a number to foreground a particular job. (In Bash, anyway.)

I use tmux, but I often use job control as an extra dimension, having several jobs in any given tmux window. (Yes, this leads to the inevitable "There are stopped jobs." warning when I attempt to exit a shell/window, which makes cleanup slightly more tedious.)