I was misdiagnosed as a baby so for about ten years my whole family were gluten free, as Mum refused to cook two meals (the others did have bread, to be fair). It wasn't a problem for us as we've never really done ready meals, and also back then there were no "Free From" items -you could get a prescription for bread/biscuits (varying degrees of niceness) and that was about it.
Some good suggestions re eating other types of food (Asian etc) but to be honest we always ate "English" food (by which I mean a whole amalgam of foods including curries, Italian dishes etc!) with the carbs being potatoes or rice. For cakes we used cornflour (maize) and no one noticed the difference - I certainly didn't when I came off the diet.
I'm not clear if you are talking about ready meals or GF pasta/bread - I know there have been improvements in the taste of the basic stuff from when I was a child, thought I'm not sure how far these have gone.
Products do seem to be very expensive - I don't know if the cost of production justifies that or if the producers think they have a captive customer base and so pad the profits. If the latter, definitely worth complaining!
I haven't been very useful on the dairy free front (if at all - sorry, just writing from childhood memories) but there are lots of substitutes which work very well. By dairy do you mean all dairy, or specifically cow products?
Not sure if that is much help I'm afraid, but definitely possible to have delicious food on this diet.