I use a lot of fresh herbs in my cooking, but for certain things, I love Morton's Nature's Seasons. I've used it for years in all sorts of things.... salad dressing, dips, potato salad, deviled eggs, actually all sorts of egg dishes! I just made some quick pickles and put it in those. I often use it in combination with fresh herbs.
I know it's just salt, pepper, sugar, garlic powder, celery salt and a few other things. But, for me, it's just the perfect blend of flavors for a lot of recipes.
I also use Montreal Steak Seasoning on burgers, though DH likes it more than I do.
Are there others I should try?