I've only been riding road bikes for a week, but i rode BMX for many years pre-university.
I have jumped on the pavement a few times on mt roadie, for instance, a bus pulls in and the car behind you drives within a few inches of the bus, your only option is to go left, but i dont realise i've done it until i'm on the pavement.
(incedently it became habit as 20" wheels are not legally allowed on the road BMX's are classed as childrens bikes, or so we were told by the local constabulary amidst being confronted for riding on the pavement by some old chap).
sorry i'm babbling, it's late, i'm tired.
my opinion is...if it has to be done it has to be done, i get less annoyed at a cyclist on a pavement than with pedestrians on cycle paths. (although my view is biased, im on 'CYCLE'chat!)
PRO