I work only 5 minutes away from home as well. There is only one downside to 98civicDX's situation. These repetitive really short trips are hard on an engine for a number of reasons. The engine never gets hot enough for long enough to boil the condensation/moisture out of the oil. If the catalytic converter doesn't get hot enough it will foul over time. Most of all the engine is operating a lot more outside of the temperature it was designed to run at so engine wear is increased.
so.... warm up time is recommended as well as a good 15 minute or longer drive.
I have to give my car an Italian tune up from time to time to burn the crud out my (trap ox/ Diesel Particulate Filter).
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