I also clear dead & dying vegetation, trying to do it as it goesw over. Otherwise in my garden the overwintering slugs & snails will have a field day come any early new shoots next Spring.
I've also got quite a lot of early bulbs in places, so need to sort things out before they start to show. I also try to add mulch as I go, but again not on top of plant crowns, just around. Mulching in Spring with the bulbs just isnt an option for me.
However in Autumn 07,10 & last year things just didnt get done at all in some places & it didnt look too bad I suppose. I know that the birds loved a lot of the taller stems remaining in 07 until about Feb 08 when I was able to start a delayed tidy up.
Depends perhaps on how tidy you are, how much time you have now & in Spring & whereabouts in UK too. Moister areas in the North & West just end up very soggy - not for us the picture of dead waving grass stems that the drier Eastern counties can have. J.