Before I went through my mid-life crisis and joined the fixed-gear cult, my commuter bike was an '86 Rockhopper. My commute is a hair over 2 miles if I take the shortest route, about 4 if I go less directly and much longer on the way home if I want.

I put slicks & a rack on the mtn bike for commuting and things worked out fine. My morning routine consists of showering & putting product in my hair, putting on work clothes, putting on cycling shoes, putting on a clip to keep my pants out of the chain, clipping in and heading to work. At work, the hair is still damp, so spend a few minutes 'styling' it before sitting down at my desk and changing shoes.

I moderate my speed/effort in the morning so that I don't work up a sweat, so that's not really a problem. Going home is a different story....