For the lower house, we've had many years of the balance of power in the hands of a small number of independents who get an outsized voice.
Yes, if you live in an non-swing electorate, that is strongly held by the incumbent, then you could argue that your vote doesn't matter, but only because there are more people voting for something else. Isn't that how things are meant to work?
Also the fact that (especially with a hung parliament which we've had for years) independents get an outsized voice is a bit of a two-edged sword. It's far more luck than anything else that determines who's in that vote-tipping seat and sometimes they demand all sorts of special-interest stuff in order to let things through.
Are you familiar with French politics? For all the crap Americans give them about surrendering in the world wars, the french have had the courage to sideline both their center right and center left parties and now the biggest parties are nationalist and socialist.