I believe pressure has a big effect on fish.
12 years ago I fished a river almost every day one summer that had a small population of small mouth bass. The river was heavily populated with suckers, northern pike minnows, and carp. There were not many bass but the ones that survived to adult hood were large and well fed.
The river got extremely low, making it very easy to find the bass. There were only a few holes that were deep enough for the bass to live. Because of limited space to live there were few bass. The visibility was poor, but the best feeding and resting spots were easy to spot. All the land around the river was private, and I was fortunate to have access to most of it. Basically I was the only pressure these fish had. Most people didn't even know there were bass there. Even the land owners were surprised when I would tell them I caught bass.
It would take me a few hours to work a section of river fishing from shore. Each section would have three to four fish-able holes. I would always catch 2 to 3 bass from 2 to 6 lbs. each, plus one or two small fish in each section. It was incredible fishing. Some days they preferred one lure over another, but because it was so obvious where the fish would hold, I would eventually find a lure and presentation that worked. If they didn't want one lure I would leave for awhile then come back and try another. If I didn't rest the spot, chances were slim that a different lure was going to work. If I gave it an hours rest, and made a good presentation on the first cast, I would usually get bit.
After completely working a section of river over in a day, that section was shot. I would have to rest a hole for at least three days or longer in order to get bit. I tried many times going back after only a day or two, even using completely different lures. No luck. I was the only pressure, but that was enough to shut the fish off due to the limited number of fish and the confines of the water. Luckily I had access to many miles of river so it was easy to rotate the best spots. I wouldn't fish a place more than twice a weak.
I can't say what pressure does to fish in other places, but I can say for sure that It had significant effect on the fish in that river in low water conditions. Best lures were inline spinners ( #3 Mepps or Vibrax), floating rapalas, Rebel craw dad, and buck tail jigs. Presentation was more important than what lure. Because of the current and depth, , inline spinners were the most versatile lure for making the best presentation. Inline spinners are good lures for pressured fish, but only good if the fish are just a few feet deep, and work best with current. Buck tail jigs work for me on pressured fish at any depth. As others have said, something different than what the fish have seen can make a big difference. Also matching the hatch is a great place to start. Fish something roughly the same size, shape, and color, with a presentation that imitates what the fish are eating. If that doesn't work try something that you are sure the fish have never seen. Many times something way larger, or way smaller than what others are fishing can work. I would try and fish a pressured pond at night, very early in the morning, or any time when it gets the least amount of pressure.