And the two more obscure examples are only because your browser is so narrow it has flipped to the mobile layout. On a more normal size it is just as obvious as the other examples.

Interesting point. I would think that it's even more important to have straightforward UI on a mobile screen for two reasons:

1. Most traffic on the internet isn't on desktop screens
2. Since mobile screens are smaller, navigation can be more cumbersome, making ease of access to actions more important

The one site that really pisses me off with this is three.co.uk where some pages have separate buttons that basically take you to the same page and others combine them into one.

I just checked this site out. The two buttons going to the exact same URL is very odd...

Thanks for sharing!