LoadToad economy has always been the bottom of the pile but it has been better. I can remember BOAC with 34 inch pitch for a start. Food is an interesting one. I think technology has probably meant that food arrives looking and tasting a bit more like food than it used to but the quantity has certainly gone down. Service is also somewhat difficult to quantify but the simple fact that crew numbers have been reduced at the same time as the number of passengers (both in abolute and load factor terms) have increased suggests a reduction in service.
I'm not suggesting that economy was ever the greatest thing since sliced bread but it isn't the same as it was.