without the legislation on the curvature of bananas
Nice cherry-picking there. Do you have any idea what the ratio is between sane legislation and inane legislation on the EU-level? Or on the level of the different member states? You seem to be under the impression that such legislation would be absent in the individual member states.
Also, don't throw the baby out with the bath water. Think about the alternative here: every member state would have different regulations on the curvature of bananas, forcing banana sellers to deal with all of those if he wants to sell his products in the EU. The EU is a pain in the ass target market as it is, with all the required localizations, communication languages, wildly varying business cultures and highly differing member state regulations on a multitude of fronts.
the lavish subsidies to farms in France and Poland
If the shit ever hits the fan on a global scale, you will be very thankful that you have at least a chance of food on your plate. If the subsidies vanish, reliance on food sources outside the EU will skyrocket as we simply cannot compete with the low cost food production elsewhere.
Powerful agricultural lobbies have a lot to do with the subsidies, but there is a very clear strategic reason for the subsidies as well.
In short, we were happy with the old EEC
Were you, though? Really? You had no complaints whatsoever about it? Or are you just regurgitating the nonsense that everything was better in the old days?
The EU can be great and we should focus on how to make it perform well, instead of clinging to our familiar arbitrary little islands in it.