I got in touch with the Ridgway Ramblers and asked about their experience of using Wordpress as a CMS. Got a nice reply from them:
"I find wordpress quite easy to use as I have no background in this kind of thing. Loading photos etc basically work on the same basis as microsoft word so is very easy. I actually use the very minimum of the tools available on wordpress as I am so inexperienced. I am sure someone with more computer skills could do a lot more with the site than me."
This gives a bit more weight to my argument - it is possible for someone with a basic level of skills to use Wordpress as a CMS and develop an attractive and detailed website.