I ride a lot at night in the city. I don't feel the need for big lights and reflectors--just a decent little LED headlight, a red blinkie, and the reflectors that came with the bike. The main reason for the headlight is not to prevent headon collisions, as someone posted, but to prevent being t-boned by cars coming out from side streets and driveways, and to prevent opposing traffic from turning left into you. So it makes sense to aim the headlight up a little, right into the eyes of motorists.
I think you would need a lot more lighting if you ride on dark country roads, and even more on trails. Slow down a little at night. A small rock or a bolt, for example, could throw you if you don't see them.
Finally, ditto to what a couple others said--night riding can be a lot of fun. It is essential to feel comfortable riding at night if you want to be a full-fledged commuter. It scared the crap out of me the first few nights, but I soon got to really like night riding.