Urgh. Can adding salt make the water take longer to boil? Sure, but it takes way more salt that you're ever going to (or should) use. To increase the boiling point of 1 quart of water by 1 degree Fahrenheit you need to add 3 tablespoons of salt (table salt not Kosher) - I don't use more that 1T per quart for my pasta so...
My favorite non stick pan is well seasoned cast iron. Cheap, easy to care for, practically indestructable.
Oh, and pasta should never swim in sauce (don't know if it was mentioned, I only skimmed). When you finish the dish you should have very little (1/2t to 1t) on the plate - it should flavor the pasta not be soup you're serving noodles in.
Gnocchi is wonderful if you get (or make) good gnocchi, but there is an awful lot of bad, heavy, lumpy, dense, chewy, boring gnocchi out there.