My research says it is not only regional, but relates to type and size of pasta being eaten, as well as the event.
There are some very long pastas eaten with thin sauces and these one may use a spoon if it is set at the place, but one wouldn't ask the hostess or waiter if it were not set.
Standard foot long pastas, be they angel hair or linguini would not be thought to need a spoon. Nor would one need a spoon at grandma's UNLESS she thought you did and gave you one...because she wanted you to get all her sauce, because you were a sloppy eater, because she was raised that way and thought you should be too.
Now very elegant settings with people eating in fine dining clothes may provide you with a spoon or a bib or both.
If you want another argument, ask a New Englander what kind of crackers go in their chowda.