I reckon it is.
I've been riding the 'cross bike recently because my fat winter tyres won't fit on the fixed. From the get-go I put it in a low gear and spin to get warm, once I've generated a bit of heat I'm fine. Fixed I only get to properly spin on a couple of sections of my commute, and they aren't at the start of my commute.
I could gear down for the winter of course.