What do you think of single page websites?

It depends on who it is for.
A single page is good for a professional of new startup company with not a whole lot to say.
I make them kind of like presentations so that they don't look like a single page site but keep the user involved in the website.
The best part of single page sites is that they load fast and you need to be concise on what you say.
Using some of the JS+CSS frameworks like webslides.tv, reveal.js, etc. you can do a lot of creative work on single page sites.