I use a bicycle as my primary mode of transportation year-round. I have a car and have no difficulty driving, though I just use that for longer trips and times when taking the bike is not practical, such as hauling items or when there is heavy rain
-Two mile commute to work takes ten minutes by bike and it saves money by not needing to pay for gas and parking decals (not to mention gym membership), and time by not needing to search for a parking space and then walking to the office (I park the bike right next to my desk). It's also faster than taking the bus, even if I didn't have to wait for it.
-One of my bikes has baskets on the back with plenty of room for bags when grocery shopping. Everything else goes in the backpack, and in rare cases, I can hang extra bags from the handlebars. It gives me great satisfaction riding past all the cars sitting in rush hour traffic while burning calories instead of gasoline
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"Tongue tied and twisted, just an earth-bound misfit, I" - Pink Floyd
(and then the tower cleared me for take off)