Lovage is a winner for us. Strong, once it's established, not too spready and it replaces celery in most uses except fresh eating.
I also love both chives and garlic chives. Thyme is another super easy one, even if it just goes in soups. Dill is tasty and pretty versatile and it self seeds enough that I treat it like a moving perennial. Bronze leaf fennel is another one you can just leave once it's settled in and use whenever you want. ( the flowers taste just like licorice allsorts)
Tarragon, oregano, horseradish and sage are more easy perennials that I'll use occasionally.
The only annuals I really go for are parsley, lemongrass and basil. So many ways to use them and they are so expensive to buy that it's always worth it to put them in every year. I have the cilantro-tastes-like-soap gene so it never makes the list.