Are you Australian? When you start talking about a hospital floor, Aussies immediately think of the floor literally
Will wards of hospitals take you on, not sure at the moment, some country/regional areas that are not so inundated with applications most likely will take you on. It seems to be the right place at the right time.
The history of the grad year is this: when nursing education went to universities it was to be a 4 year degree (like other health professions and free. The government however wanted nurses churned out quickly and did not want to pay for the extra year. So the graduate year was brought in, so that new graduates had the right to say, sorry cannot do, I am a graduate, clinical instructors where put in place in hospitals so there is lots of support, so yes it is important to do the grad year.
The big city hospitals however are asking for nurses that have completed an graduate year before considering them for a position. This is not the criteria, but with so many locals looking for jobs and the inundation from overseas they are picking and choosing. Nurses with no experience from overseas are not safe, it is a different culture, health system, different medications/names, different way doctors order ivs (RN in Australia do everything including IV therapy, mixing antis this is one way of making sure nurses are safe to practise independently with much support when they need it. If you have not got experience as new nurse in own country then it will be doubly hard to be a nurse with confidence and and safe practise in a new country.
Victoria still has vacant positions being advised on the PMVC? site, though they now have got the criteria that you must be a citizen or have pr visa, even if you manage to do 6 months in a subacute/acute position is enough to lay foundations for applying in the future.
So the answer to your question, officially no, you do not have to do a grad year before being considered for other positions, but if you want the big acute hospital,, they are asking for it. If you are from overseas, yes definitely, you must have experience in own country, before agencies or hospitals are going to employ you, even on working visa.
BTW orientation in Australian hospitals is usually 3 days.