@georgeob1,
First: there are no constitutional limits because there is no constitution, even not unwritten like in the UK.
Second: actually, there are seven institutions in the EU:
• Council of the European Union – executive and legislative
• European Commission – executive, legislative and quasi-judicial
• European Council – executive
• European Court of Auditors – audit
• Court of Justice of the European Union and the General Court – judicial
• European Parliament – legislative.
In my opinion, the problem with all this is that we like it compare with where we live, what we know. But the EU is neither a country nor a federation.
You're correct, george, all came and comes from the various treaties.
Compared to the administrations elsewhere (in Europe), the EU's administration has a normal seize and is less autonomous like e.g. the administration here in my state.
Third:
This "ever closer union" is indeed a problem, not only for you. (But not mine!)
The Heads of State or Government, on the basis of an awareness of a common destiny and the wish to affirm the European identity, confirm their commitment to progress towards an ever closer union among the peoples and Member States of the European Community.
(From the 'Solemn Declaration on European Union', signed by the then 10 heads of state and government [Belgium, France, Italy, Luxembourg, the Netherlands, Germany as the original six plus Denmark, Ireland, the United Kingdom and Greece] on Sunday 19 June 1983, at the Stuttgart European Council.
This was leading to the formation of the European Single Market - and since 1993, a lot more (including the treaties etc you mentioned) happened.