I commute about half the time on a fixed-gear bike.
If I could only have one bike, it wouldn't be fixed. At the same time, I've never had any inclination to ride singlespeed.
Riding singlespeed would solve most of the issued I have with fixed, but it would also remove the things I enjoy about it. I like the feeling, I like that I climb the hills of my commute faster. I don't like that I tend to spin out of my comfort zone if the road angles down at all. I used to hate all downhills, but between switching to larger gears (in the 78 gear inch range) and faster spin I can ride anything I encounter without the brake (I max out about 38mph).
I rarely ride fixed for more than 3 days in a row though. My legs tend to get a little sore from the stoplight starts after a couple of days. I did try setting up my bike with a much lower gear ratio and trying to take it easy. I absolutely hated it, mostly because of my bike positioning though.
I have considered ditching the trackish frames though and building up something like a Casseroll to add a little practicality.
-----------
BTW, the hybrid insults are childish and uncalled for guys.