I rarely patronize a salad bar, but love building one at home with fresh things from the grocery or farmer's market. I love bitter greens, so my salad always include arugula and/or escarole. Other ingredients usually include some combination of: Swiss chard, Romaine lettuce, heirloom tomatoes or Campari tomatoes, Vidalia or sweet onions, sweet peppers, radish or turnip, beets, Mont Olive Butter Chip pickles, and a little cheese. Favorite cheeses are: Swiss, Asiago, Gouda, Parmesan, Monterey Jack, but I like to mix a bit of several to experiment with the flavors. Occasionally broccoli, spinach, and Kale make into my salds. I am do not like salad dressing (it's a gastro system thing for me). I save the leftover juices from the Mount Olive pickle jars to use as salad dressing.
I think it's the too many hands touching at salad bars which turn me off. The kitchen staff may slip up with hygiene, but sometimes restaurant managers require those preparing salads to wear gloves, so I feel more comfortable ordering a prepared salad. Even with that bit of sanitary security, I still eat most of my salads at home.