The truth is that making the dressing is super easy! If you can measure and whisk, you can do it. Both a creamy mayonnaise-based pasta salad dressing and a vinaigrette are so much better if you make them from scratch.
To make a creamy pasta salad dressing, put all ingredients in a bowl, and whisk together until smooth. To make a vinaigrette, whisk together all the ingredients except the oil. Slowly drizzle in the oil while whisking continuously until the mixture emulsifies, or comes together into a smooth consistency that does not separate.