If you had reflux triggers before surgery, you will have them afterwards.
Reflux triggers are from food intolerances, aka allergies. My allergist says intolerances are allergies, my GI doc doesn't believe in any of it. He keeps insisting I prefer "natural foods." No! I'd rather eat junk food, but I can't. If I eat foods to which I am intolerant, even though I don't get refluxing all the way into my esophagus post-op, it will still trigger tachycardia from cardio-esophgeal reflex. (The esophagus and stomach are connected to the heart and other organs by the vagus nerve.)
Of course if you had no trouble with foods, just needed surgery because of a bad LES or a really huge hernia, you will probably be able to return to your regular diet. I'd caution eating much smaller portions for a long time though, and maybe watching out for gassy foods like bread and a lot of the nicer vegetables.
Summer squashes, beets, greens, carrots and rice don't seem to cause much trouble.