I'd estimate trucks have gotten approximately on average 1% bigger and 1% more powerful every year for the last 30 years, making them roughly 30% larger and more powerful over 3 decades. Technology has allowed them to be more efficient on fuel, more power efficient, smaller supercharged engines, trim weight, and backup cameras help with their maneuverability and size. The Rangers and Tacomas of today are about the size and slightly more power compared to the F150s and Tundras of a few decades ago, and the entire 1/2 ton, 3/4 ton nomenclature has been altered as a result. The current "3/4 ton and 1 ton" trucks today are behemoths. Here's an example of a F350 "Sport" with shorter bed, that cannot come close to fitting in a parking spot. Look at the full sized SUVs next to it, nearly completely blocked by the truck. Somehow, I doubt this is being used for it's designed purpose of hauling horses ...
Look at the normal sized sedan next to these monstrosities that are clearly not farm duty trucks. The wheels are as tall as the hood of the car. They could probably drive over the car, and roll the truck, especially in a collision. The truck hoods are 5' off the ground, about the height of the top of the passenger car. I see these trucks, ALL OVER the city, and they are DDs and not being used as one would generally buy a truck to use it for truck duties. They're 75% from my guess, status symbols and daily drivers.
Good example:
Similar has occurred with SUVs and to an extent passenger cars. They've bulked up. The Expeditions, Sequoias, Land Rovers, and so forth have all added 30% size.
Yes, parking spaces have generally gotten smaller. I've seen lots increase the number of spaces by 10% when repainted, simply by shrinking the parking spaces commensurately.