With primary teaching being on the ISSL now I think that this means you can apply for jobs in NZ on an equal footing with New Zealanders, whereas before an employer could only offer you the job if there were no suitably qualified NZ teachers applying. [ which seems a bit unlikely unless it's in the worst areas.] They would also have had to complete a form NZ1113 I think , declaring this to the government, which must have put some employers off overseas trained staff.
I do hope that NZ schools truly are more reasonable over workload than here, I do know of a primary teacher who has recently settled in NZ and she had found Part Time in the UK to be practically full time and hated it. Now she has done a year of PT in NZ and enjoyed it so much that she has applied for FT posts!
Regards Mike