I've signed mortgage documents several times in the past few years, and I've had the opposite experience. The first time they openly scoffed at me for taking the time to read it. Took about two hours to read >100 pages.
When I bought my house, we were taken into a room with the selling and buying agent, and they read the mortgage document aloud, and asked if we had any questions after each page that we had to sign.
They said that was the law in the area. It took about 3 hours, and every party went home with a copy with the 4th copy getting filed with the county.