I would have agreed a few years ago when I used to go to Cornwall on family holidays.
I moved her 2 years ago - by chance, I hadn't planned on living in Cornwall but work took me this way - and I LOVE it! I have never felt more at home than I do here. August is a bit of a grind I'll grant you, but the rest of the year it is stunning.
To those who are complaining of high streets full of fat face and jules, unfortunately just like every other town in England, small local boutique businesses cannot afford high street rents, it you just venture out from the centre a little you will find all of our hidden gems, including fabulous, reasonably priced coffee, ice cream, and eateries like you cannot find anywhere else in the country.
Towns like Padstow and Port Isaac are amazing at every other time than high season, unfortunately those quaint little cobble streets that look like they must be pedestrianised are in fact just the road that we have to drive on in order to get from home to work.
Even in august it is possible to get away from the crowds - I have just got home from an hour and half walk with the dogs in the woods and I didn't see a single person, all I could hear were the occasional airplane, heaven.
There is so much more to do here than beaches but Cornwall is not a resort - you will have to drive to do things. Try taking a Fal river cruise, visiting a few of our amazing NT places (Glendurgan has a great maze and Godolfin is beautiful), check out the heritage at the museum in Falmouth (and go for Harbour Lights fish and chips )...