I have a small attached garage (20x22). When I moved in 4 years ago, the lighting consisted of 2 100w incandescent bulbs hanging in porcelain fixtures. There were only 2 outlets, and one of them was on the ceiling for the garage door opener. Both outlets and the lights were all on the same 15A circuit. That same circuit also feeds some bedroom outlets and some other lights.
I replaced the light fixtures with 2 8' fluorescent fixtures (and eventually converted them to LED tubes), and added a 4' fixture over the workbench, and another 4' fixture as a task light. I installed a 100A subpanel in the garage and ran surface-mount EMT conduit everywhere, adding about 18 outlets total on all the walls, on three 20A circuits. Also wired up a 240V electric heater, and I'm currently trying to finish up wiring my 60 gallon air compressor, which I installed in the basement, on the opposite side of the house from the garage.
I used to complain about my garage wiring...a lot...but not anymore!