It's mostly new. If you're young enough to consider something after the first half of the Clinton Administration new.
Using that same aerial photo from 1995 to show what is now the Simba parking lot, we see that it's mostly unused farmland. But there's a few motels along what would become Disneyland Drive (then known as West Street). In the southwest corner there's a structure that is unknown to me, or at least I don't remember. It looks like it might have been a movie theater? But the majority of it is dirt, likely an old citrus orchard that had been cleared by '95 in preparation for development. The Pan Pacific Hotel (now Pixar Place Hotel) is clearly seen in '95, along with its existing parking structure.
But for the most part, the Simba Parking Lot as we know it circa 2001-2024 was non-existent in 1995.
View attachment 770717
Thinking back to the 20th century, I mostly remember this corner of the Resort District as the location of the fabulously kitschy, even at the time, location of the several futuristic Best Western theme motels owned by the Stovall family. They were located directly south of what is now the Simba lot on Katella.
(TP2000 Brush With Celebrity Greatness: I chatted a few times with the Stovall heiress at parties in the 2000's in Villa Park.)