Yes, the other day my fairer half parked her mk6 (before the current "new" one) Fiesta beside a Sierra. It was only a couple of inches shorter than the jellymould!
Noticed too when I had the Xantia it was about the same length as a "supermini" 207.
They're getting that big that car companies keep having to put smaller cars in their place.
The new Polo is as big as a mk1 Golf (which itself used to be a small car), so they brought in the Fox.
The new Fiesta is as big as a mk1 Focus, so they have the Ka, which itself is now bigger than the original.
The Yaris, as demonstrated in your picture, is so big they replaced the supermini with the Aygo and the iQ thing.
It's to do with extra airbags and impact bars and luxuries such as aircon and multiple speakers (compare a Fiat Panda mk1 or a Citroen AX with a modern supermini and the modern car is a huge step up in terms of the feeling of solidity and toys).
Bit annoying though that parking space widths remain static, while young mothers try and squeeze huge SUV 4x4s beside your GTV / 166.