In reply to puppythedog:
Depends as well on the type of route you want to climb. Climbing ice, even Scottish gully snice, under other parties is a bad idea for obvious reasons, hence I'll wake up earlier to be first on a route if it's one like that. This has worked for me a couple of times this season.
Something like Tower Ridge, the chances of ice being knocked down on you are minimal, if a party or two are ahead of you unless they are quite slow or you are really fast it shouldn't make too much difference. Even if you get stuck behind someone, it's probably not too bad a route to overtake on.