Well the election goes on for the next two weeks so I wouldn’t expect to have had impact YET! They haven’t started counting the votes.
That said. In a first past the post single member electoral district system, yes most people’s votes don’t count. In a proportional system one vote does count towards 1/3,000,000th of the results. Given there are about 3 million voter cast in New Zealand parliamentary elections. So yep. I feel pretty good about it actually. I choose to move to a funcional democracy and now I get to participate.